dialog Module

Bogdan-Andrei Iancu

   Voice Sistem SRL

Carsten Bock

   ng-voice.com

Edited by

Bogdan-Andrei Iancu

Carsten Bock

Alex Balashov

   <abalashov@evaristesys.com>

Olle E. Johansson

   <oej@edvina.net>

Surendra Tiwari

   <surendratiwari3@gmail.com>

Julien Klingenmeyer

   <julien.klingenmeyer@corp.ovh.com>

   Copyright © 2006 Voice Sistem SRL

   Copyright © 2011, 2022 ng-voice GmbH, Carsten Bock,
   http://www.ng-voice.com
     __________________________________________________________________

   Table of Contents

   1. Admin Guide

        1. Overview
        2. How it works
        3. Dialog states
        4. Dialog profiling
        5. Dependencies

              5.1. Kamailio Modules
              5.2. External Libraries or Applications

        6. Parameters

              6.1. enable_stats (integer)
              6.2. hash_size (integer)
              6.3. rr_param (string)
              6.4. dlg_flag (integer)
              6.5. timeout_avp (string)
              6.6. default_timeout (integer)
              6.7. early_timeout (integer)
              6.8. noack_timeout (integer)
              6.9. end_timeout (integer)
              6.10. dlg_extra_hdrs (string)
              6.11. dlg_match_mode (integer)
              6.12. detect_spirals (integer)
              6.13. db_url (string)
              6.14. db_mode (integer)
              6.15. db_update_period (integer)
              6.16. db_fetch_rows (integer)
              6.17. db_skip_load (integer)
              6.18. table_name (string)
              6.19. call_id_column (string)
              6.20. from_uri_column (string)
              6.21. from_tag_column (string)
              6.22. to_uri_column (string)
              6.23. to_tag_column (string)
              6.24. from_cseq_column (string)
              6.25. to_cseq_column (string)
              6.26. from_route_column (string)
              6.27. to_route_column (string)
              6.28. from_contact_column (string)
              6.29. to_contact_column (string)
              6.30. from_sock_column (string)
              6.31. to_sock_column (string)
              6.32. h_id_column (string)
              6.33. h_entry_column (string)
              6.34. state_column (string)
              6.35. start_time_column (string)
              6.36. timeout_column (string)
              6.37. sflags_column (string)
              6.38. toroute_name_column (string)
              6.39. vars_table_name (string)
              6.40. vars_h_id_column (string)
              6.41. vars_h_entry_column (string)
              6.42. vars_key_column (string)
              6.43. vars_value_column (string)
              6.44. profiles_with_value (string)
              6.45. profiles_no_value (string)
              6.46. bridge_controller (string)
              6.47. bridge_contact (string)
              6.48. initial_cbs_inscript (int)
              6.49. send_bye (int)
              6.50. dlg_filter_mode (int)
              6.51. wait_ack (int)
              6.52. ka_timer (int)
              6.53. ka_interval (int)
              6.54. ka_failed_limit (int)
              6.55. timeout_noreset (int)
              6.56. timer_procs (int)
              6.57. enable_dmq (int)
              6.58. track_cseq_updates (int)
              6.59. lreq_callee_headers (string)
              6.60. event_callback (str)
              6.61. h_id_start (int)
              6.62. h_id_step (int)
              6.63. keep_proxy_rr (string)
              6.64. bye_early_code (int)
              6.65. bye_early_reason (string)
              6.66. dlg_ctxiuid_mode (int)
              6.67. debug_variables (int)

        7. Functions

              7.1. set_dlg_profile(profile[, value])
              7.2. unset_dlg_profile(profile[, value])
              7.3. is_in_profile(profile[, value])
              7.4. get_profile_size(profile[, value], size)
              7.5. dlg_isflagset(flag)
              7.6. dlg_setflag(flag)
              7.7. dlg_resetflag(flag)
              7.8. dlg_bye(side)
              7.9. dlg_refer(side, address)
              7.10. dlg_manage()
              7.11. dlg_bridge(from, to, op)
              7.12. dlg_get(callid, ftag, ttag)
              7.13. dlg_get_var(callid, ftag, ttag, name, dst)
              7.14. dlg_set_var(callid, ftag, ttag, name, value)
              7.15. is_known_dlg()
              7.16. dlg_set_timeout(timeout [, h_entry, h_id])
              7.17. dlg_set_timeout_by_profile(profile, [value], timeout)
              7.18. dlg_set_property(attr)
              7.19. dlg_remote_profile(cmd, profile, value, uid, expires)
              7.20. dlg_set_ruri()
              7.21. dlg_db_load_callid(cival)
              7.22. dlg_db_load_extra()
              7.23. dlg_reset_property(attr)
              7.24. dlg_req_within(side, method, [headers], [content_type,
                      content])

        8. Statistics

              8.1. active_dialogs
              8.2. early_dialogs
              8.3. processed_dialogs
              8.4. expired_dialogs
              8.5. failed_dialogs

        9. RPC Commands

              9.1. dlg.list
              9.2. dlg.list_ctx
              9.3. dlg.list_match
              9.4. dlg.list_match_ctx
              9.5. dlg.dump_file
              9.6. dlg.dlg_list
              9.7. dlg.dlg_list_ctx
              9.8. dlg.terminate_dlg
              9.9. dlg.end_dlg
              9.10. dlg.set_state
              9.11. dlg.profile_get_size
              9.12. dlg.profile_list
              9.13. dlg.bridge_dlg
              9.14. dlg.stats_active
              9.15. dlg.is_alive
              9.16. dlg.briefing

        10. Exported Variables

              10.1. $DLG_count
              10.2. $DLG_status
              10.3. $DLG_lifetime
              10.4. $dlg(...)
              10.5. $dlg_ctx(...)
              10.6. $dlg_var(key)

        11. Event Routes

              11.1. event_route[dialog:start]
              11.2. event_route[dialog:end]
              11.3. event_route[dialog:failed]

   2. Developer Guide

        1. Available Functions

              1.1. register_dlgcb (dialog, type, cb, param, free_param_cb)

              1.2. terminate_dlg (dlg, hdrs)

   3. Frequently Asked Questions

   List of Examples

   1.1. Set enable_stats parameter
   1.2. Set hash_size parameter
   1.3. Set rr_param parameter
   1.4. Set dlg_flag parameter
   1.5. Set timeout_avp parameter
   1.6. Set default_timeout parameter
   1.7. Set early_timeout parameter
   1.8. Set noack_timeout parameter
   1.9. Set end_timeout parameter
   1.10. Set dlf_extra_hdrs parameter
   1.11. Set dlg_match_mode parameter
   1.12. Set detect_spirals parameter
   1.13. Set db_url parameter
   1.14. Set db_mode parameter
   1.15. Set db_update_period parameter
   1.16. Set db_fetch_rows parameter
   1.17. Set db_skip_load parameter
   1.18. Set table_name parameter
   1.19. Set call_id_column parameter
   1.20. Set from_uri_column parameter
   1.21. Set from_tag_column parameter
   1.22. Set to_uri_column parameter
   1.23. Set to_tag_column parameter
   1.24. Set from_cseq_column parameter
   1.25. Set to_cseq_column parameter
   1.26. Set from_route_column parameter
   1.27. Set to_route_column parameter
   1.28. Set from_contact_column parameter
   1.29. Set to_contact_column parameter
   1.30. Set from_sock_column parameter
   1.31. Set to_sock_column parameter
   1.32. Set h_id_column parameter
   1.33. Set h_entry_column parameter
   1.34. Set state_column parameter
   1.35. Set start_time_column parameter
   1.36. Set timeout_column parameter
   1.37. Set sflags_column parameter
   1.38. Set toroute_name_column parameter
   1.39. Set vars_table_name parameter
   1.40. Set vars_h_id_column parameter
   1.41. Set vars_h_entry_column parameter
   1.42. Set vars_key_column parameter
   1.43. Set vars_value_column parameter
   1.44. Set profiles_with_value parameter
   1.45. Set profiles_no_value parameter
   1.46. Set bridge_controller parameter
   1.47. Set bridge_contact parameter
   1.48. Set initial_cbs_inscript parameter
   1.49. Set send_bye parameter
   1.50. Set dlg_filter_mode parameter
   1.51. Set wait_ack parameter
   1.52. Set ka_timer parameter
   1.53. Set ka_interval parameter
   1.54. Set ka_failed_limit parameter
   1.55. Set timeout_noreset parameter
   1.56. Set timer_procs parameter
   1.57. Set enable_dmq parameter
   1.58. Set track_cseq_updates parameter
   1.59. Set lreq_callee_headers parameter
   1.60. Set event_callback parameter
   1.61. Set h_id_start parameter
   1.62. Set h_id_step parameter
   1.63. Set dlg_keep_proxy_rr parameter
   1.64. Set bye_early_code parameter
   1.65. Set bye_early_reason parameter
   1.66. Set dlg_ctxiuid_mode parameter
   1.67. Set debug_variables parameter
   1.68. set_dlg_profile usage
   1.69. unset_dlg_profile usage
   1.70. is_in_profile usage
   1.71. get_profile_size usage
   1.72. dlg_isflagset usage
   1.73. dlg_setflag usage
   1.74. dlg_resetflag usage
   1.75. dlg_bye usage
   1.76. dlg_refer usage
   1.77. dlg_manage usage
   1.78. dlg_bridge usage
   1.79. dlg_get usage
   1.80. dlg_get_var usage
   1.81. dlg_set_var usage
   1.82. is_known_dlg() usage
   1.83. dlg_set_timeout usage
   1.84. dlg_set_timeout_by_profile usage
   1.85. dlg_set_property usage
   1.86. dlg_remote_profile usage
   1.87. dlg_set_ruri() usage
   1.88. dlg_db_load_callid() usage
   1.89. dlg_db_load_extra() usage
   1.90. dlg_reset_property usage
   1.91. dlg_req_within usage

Chapter 1. Admin Guide

   Table of Contents

   1. Overview
   2. How it works
   3. Dialog states
   4. Dialog profiling
   5. Dependencies

        5.1. Kamailio Modules
        5.2. External Libraries or Applications

   6. Parameters

        6.1. enable_stats (integer)
        6.2. hash_size (integer)
        6.3. rr_param (string)
        6.4. dlg_flag (integer)
        6.5. timeout_avp (string)
        6.6. default_timeout (integer)
        6.7. early_timeout (integer)
        6.8. noack_timeout (integer)
        6.9. end_timeout (integer)
        6.10. dlg_extra_hdrs (string)
        6.11. dlg_match_mode (integer)
        6.12. detect_spirals (integer)
        6.13. db_url (string)
        6.14. db_mode (integer)
        6.15. db_update_period (integer)
        6.16. db_fetch_rows (integer)
        6.17. db_skip_load (integer)
        6.18. table_name (string)
        6.19. call_id_column (string)
        6.20. from_uri_column (string)
        6.21. from_tag_column (string)
        6.22. to_uri_column (string)
        6.23. to_tag_column (string)
        6.24. from_cseq_column (string)
        6.25. to_cseq_column (string)
        6.26. from_route_column (string)
        6.27. to_route_column (string)
        6.28. from_contact_column (string)
        6.29. to_contact_column (string)
        6.30. from_sock_column (string)
        6.31. to_sock_column (string)
        6.32. h_id_column (string)
        6.33. h_entry_column (string)
        6.34. state_column (string)
        6.35. start_time_column (string)
        6.36. timeout_column (string)
        6.37. sflags_column (string)
        6.38. toroute_name_column (string)
        6.39. vars_table_name (string)
        6.40. vars_h_id_column (string)
        6.41. vars_h_entry_column (string)
        6.42. vars_key_column (string)
        6.43. vars_value_column (string)
        6.44. profiles_with_value (string)
        6.45. profiles_no_value (string)
        6.46. bridge_controller (string)
        6.47. bridge_contact (string)
        6.48. initial_cbs_inscript (int)
        6.49. send_bye (int)
        6.50. dlg_filter_mode (int)
        6.51. wait_ack (int)
        6.52. ka_timer (int)
        6.53. ka_interval (int)
        6.54. ka_failed_limit (int)
        6.55. timeout_noreset (int)
        6.56. timer_procs (int)
        6.57. enable_dmq (int)
        6.58. track_cseq_updates (int)
        6.59. lreq_callee_headers (string)
        6.60. event_callback (str)
        6.61. h_id_start (int)
        6.62. h_id_step (int)
        6.63. keep_proxy_rr (string)
        6.64. bye_early_code (int)
        6.65. bye_early_reason (string)
        6.66. dlg_ctxiuid_mode (int)
        6.67. debug_variables (int)

   7. Functions

        7.1. set_dlg_profile(profile[, value])
        7.2. unset_dlg_profile(profile[, value])
        7.3. is_in_profile(profile[, value])
        7.4. get_profile_size(profile[, value], size)
        7.5. dlg_isflagset(flag)
        7.6. dlg_setflag(flag)
        7.7. dlg_resetflag(flag)
        7.8. dlg_bye(side)
        7.9. dlg_refer(side, address)
        7.10. dlg_manage()
        7.11. dlg_bridge(from, to, op)
        7.12. dlg_get(callid, ftag, ttag)
        7.13. dlg_get_var(callid, ftag, ttag, name, dst)
        7.14. dlg_set_var(callid, ftag, ttag, name, value)
        7.15. is_known_dlg()
        7.16. dlg_set_timeout(timeout [, h_entry, h_id])
        7.17. dlg_set_timeout_by_profile(profile, [value], timeout)
        7.18. dlg_set_property(attr)
        7.19. dlg_remote_profile(cmd, profile, value, uid, expires)
        7.20. dlg_set_ruri()
        7.21. dlg_db_load_callid(cival)
        7.22. dlg_db_load_extra()
        7.23. dlg_reset_property(attr)
        7.24. dlg_req_within(side, method, [headers], [content_type,
                content])

   8. Statistics

        8.1. active_dialogs
        8.2. early_dialogs
        8.3. processed_dialogs
        8.4. expired_dialogs
        8.5. failed_dialogs

   9. RPC Commands

        9.1. dlg.list
        9.2. dlg.list_ctx
        9.3. dlg.list_match
        9.4. dlg.list_match_ctx
        9.5. dlg.dump_file
        9.6. dlg.dlg_list
        9.7. dlg.dlg_list_ctx
        9.8. dlg.terminate_dlg
        9.9. dlg.end_dlg
        9.10. dlg.set_state
        9.11. dlg.profile_get_size
        9.12. dlg.profile_list
        9.13. dlg.bridge_dlg
        9.14. dlg.stats_active
        9.15. dlg.is_alive
        9.16. dlg.briefing

   10. Exported Variables

        10.1. $DLG_count
        10.2. $DLG_status
        10.3. $DLG_lifetime
        10.4. $dlg(...)
        10.5. $dlg_ctx(...)
        10.6. $dlg_var(key)

   11. Event Routes

        11.1. event_route[dialog:start]
        11.2. event_route[dialog:end]
        11.3. event_route[dialog:failed]

1. Overview

   Kamailio can behave as a stateful proxy through the TM module. However,
   "stateful" in this context refers to transaction state, not dialog
   state. Certain applications may benefit from an awareness of "calls" in
   the proxy, not just SIP transactions.

   For example, a common need is to limit the number of calls that can be
   made concurrently by an endpoint, account, user group, etc. In order to
   count the number of calls in progress, it is necessary for the proxy to
   be aware of whole dialogs, not just transactions, and to provide some
   means of programmatically classifying these dialogs. This is just one
   common application discussed for illustrative purposes; there are many
   others.

   The dialog module provides dialog awareness for the Kamailio proxy. Its
   functionality is to keep track of the current dialogs, to offer
   information about them (e.g. how many dialogs are active), and to
   manage various characteristics of dialogs. The module exports several
   functions that can be used directly from the configuration route script
   as well as functions for the RPC interface.

   This module also provides an API foundation on which to build more
   complex dialog-oriented functionality in other Kamailio modules.

2. How it works

   To create the dialog associated with an initial INVITE request, execute
   the function “dlg_manage()” or set the flag specified by parameter
   “dlg_flag” (Section 6.4, “dlg_flag (integer)”) before creating the
   corresponding transaction.

   The dialog is automatically destroyed when a “BYE” is received. In case
   of no “BYE”, the dialog lifetime is controlled via the default timeout
   (see “default_timeout” - Section 6.6, “default_timeout (integer)”) and
   custom timeout (see “timeout_avp” - Section 6.5, “timeout_avp
   (string)”). The dialog timeout is reset each time a sequential request
   is processed.

3. Dialog states

   Dialogs have states that are shown in the RPC interface as well as
   stored in the database.
     * 1 : Unconfirmed dialog
     * 2 : Early dialog (ringing)
     * 3 : Confirmed dialog (waiting for ACK)
     * 4 : Confirmed dialog (active call)
     * 5 : Deleted dialog

   The early and deleted dialog states are not updated in database
   storage.

4. Dialog profiling

   Dialog profiling is a mechanism that helps in classifying, sorting and
   keeping track of certain types of dialogs. The classification criteria
   can be any attributes desired by the administrator; it can be SIP
   message attributes, other pseudo-variables, custom values, etc. Dialogs
   can be dynamically added into one or more profile tables. Logically,
   each profile table can have a special meaning (like dialogs outside the
   domain, dialogs terminated to the PSTN, etc.).

   There are two types of profiles:
     * with no value - a dialog simply belongs to a profile (for instance,
       an outbound calls profile). There is no other additional
       information to describe the dialog beyond its membership in the
       profile per se.
     * with value - a dialog belongs to a profile having a certain value
       (like in a caller profile, where the value is the caller ID). The
       membership of the dialog in the profile is strictly related to the
       value. For example, if the account ID of the caller is stored in
       the pseudo-variable $var(account_id), you can use $var(account_id)
       as a value/key by which to group dialogs so that you can count the
       number of open dialogs for each account, enforce concurrent call
       limits as necessary, etc.

   A dialog can be added to multiple profiles at the same time.

   Profiles are visible (at the moment) in the request route (for initial
   and sequential requests) and in the branch, failure and reply routes of
   the original request.

5. Dependencies

   5.1. Kamailio Modules
   5.2. External Libraries or Applications

5.1. Kamailio Modules

   The following modules must be loaded before this module:
     * TM - Transaction module
     * RR - Record-Route module
     * PV - Pseudovariables module

5.2. External Libraries or Applications

   The following libraries or applications must be installed before
   running Kamailio with this module loaded:
     * None.

6. Parameters

   6.1. enable_stats (integer)
   6.2. hash_size (integer)
   6.3. rr_param (string)
   6.4. dlg_flag (integer)
   6.5. timeout_avp (string)
   6.6. default_timeout (integer)
   6.7. early_timeout (integer)
   6.8. noack_timeout (integer)
   6.9. end_timeout (integer)
   6.10. dlg_extra_hdrs (string)
   6.11. dlg_match_mode (integer)
   6.12. detect_spirals (integer)
   6.13. db_url (string)
   6.14. db_mode (integer)
   6.15. db_update_period (integer)
   6.16. db_fetch_rows (integer)
   6.17. db_skip_load (integer)
   6.18. table_name (string)
   6.19. call_id_column (string)
   6.20. from_uri_column (string)
   6.21. from_tag_column (string)
   6.22. to_uri_column (string)
   6.23. to_tag_column (string)
   6.24. from_cseq_column (string)
   6.25. to_cseq_column (string)
   6.26. from_route_column (string)
   6.27. to_route_column (string)
   6.28. from_contact_column (string)
   6.29. to_contact_column (string)
   6.30. from_sock_column (string)
   6.31. to_sock_column (string)
   6.32. h_id_column (string)
   6.33. h_entry_column (string)
   6.34. state_column (string)
   6.35. start_time_column (string)
   6.36. timeout_column (string)
   6.37. sflags_column (string)
   6.38. toroute_name_column (string)
   6.39. vars_table_name (string)
   6.40. vars_h_id_column (string)
   6.41. vars_h_entry_column (string)
   6.42. vars_key_column (string)
   6.43. vars_value_column (string)
   6.44. profiles_with_value (string)
   6.45. profiles_no_value (string)
   6.46. bridge_controller (string)
   6.47. bridge_contact (string)
   6.48. initial_cbs_inscript (int)
   6.49. send_bye (int)
   6.50. dlg_filter_mode (int)
   6.51. wait_ack (int)
   6.52. ka_timer (int)
   6.53. ka_interval (int)
   6.54. ka_failed_limit (int)
   6.55. timeout_noreset (int)
   6.56. timer_procs (int)
   6.57. enable_dmq (int)
   6.58. track_cseq_updates (int)
   6.59. lreq_callee_headers (string)
   6.60. event_callback (str)
   6.61. h_id_start (int)
   6.62. h_id_step (int)
   6.63. keep_proxy_rr (string)
   6.64. bye_early_code (int)
   6.65. bye_early_reason (string)
   6.66. dlg_ctxiuid_mode (int)
   6.67. debug_variables (int)

6.1. enable_stats (integer)

   If statistics support should be enabled or not. Via statistics
   variables, the module provides information about the dialog processing.
   Set it to zero to disable or to non-zero to enable it.

   Default value is “1 (enabled)”.

   Example 1.1. Set enable_stats parameter
...
modparam("dialog", "enable_stats", 0)
...

6.2. hash_size (integer)

   The size of the hash table internally used to keep the dialogs. A
   larger table is much faster but consumes more memory. The hash size
   must be a power of two.

   IMPORTANT: If dialog information should be stored in a database, a
   constant hash_size should be used, otherwise the restoring process will
   not take place. If you really want to modify the hash_size, you must
   delete all table's rows before restarting the server.

   Default value is “4096”.

   Example 1.2. Set hash_size parameter
...
modparam("dialog", "hash_size", 1024)
...

6.3. rr_param (string)

   Name of the Record-Route parameter used to store the dialog cookie. It
   is used for the fast matching of sequential requests to tracked
   dialogs.

   Default value is “did”.

   Example 1.3. Set rr_param parameter
...
modparam("dialog", "rr_param", "xyz")
...

6.4. dlg_flag (integer)

   Flag to be used for marking if a dialog should be constructed for the
   current request (this makes sense only for initial requests).

   Note: it is not needed to set this parameter and its corresponding flag
   for initial request in case the “dlg_manage()” function is used. In
   other words, using “dlg_manage()” alone is enough.

   Default value is “none”.

   Example 1.4. Set dlg_flag parameter
...
modparam("dialog", "dlg_flag", 4)
...

6.5. timeout_avp (string)

   The specification of an AVP that contains a custom timeout value (in
   seconds) for the dialog. It may be used only in a request (initial or
   sequential) context.

   Default value is “none”.

   Example 1.5. Set timeout_avp parameter
...
modparam("dialog", "timeout_avp", "$avp(i:10)")
...

6.6. default_timeout (integer)

   The default dialog timeout (in seconds), in the absence of a custom
   value provided in an AVP.

   Default value is “43200 (12 hours)”.

   Example 1.6. Set default_timeout parameter
...
modparam("dialog", "default_timeout", 21600)
...

6.7. early_timeout (integer)

   The timeout (in seconds) after which the dialogs in unconfirmed or
   early state (no final response received) are destroyed.

   Default value is “300 (5 minutes)”.

   Example 1.7. Set early_timeout parameter
...
modparam("dialog", "early_timeout", 180)
...

6.8. noack_timeout (integer)

   The timeout (in seconds) after which the dialogs which were answered
   with 200 OK but didn't receive the ACK are marked for termination (the
   lifetime is set to 10 more seconds).

   Default value is “60 (1 minute)”.

   Example 1.8. Set noack_timeout parameter
...
modparam("dialog", "noack_timeout", 90)
...

6.9. end_timeout (integer)

   The timeout (in seconds) after which the dialogs in terminated state
   are destroyed.

   Default value is “300 (5 minutes)”.

   Example 1.9. Set end_timeout parameter
...
modparam("dialog", "end_timeout", 180)
...

6.10. dlg_extra_hdrs (string)

   A string containing the extra headers (full format, with EOH) to be
   added to requests generated locally by the module (like BYEs).

   Default value is “NULL”.

   Example 1.10. Set dlf_extra_hdrs parameter
...
modparam("dialog", "dlg_extra_hdrs", "Hint: credit expired\r\n")
...

6.11. dlg_match_mode (integer)

   How the sequential requests should be matched against the known
   dialogs. The modes are a combination of matching based on a cookie
   (DID) stored as cookie in Record-Route header and matching based on SIP
   elements (as in RFC 3261).

   Note: DID-based matching does not replace callid/fromtag/totag
   comparison. It will speed up dialog matching by not iterating over the
   whole dialog list for callid/fromtag/totag comparison, but instead it
   uses a hash table to find the respective dialog and then doing only one
   callid/fromtag/totag comparison. Thus, there is no security issue when
   using DID based matching. Use DID_FALLBACK for maximum interoperability
   or use DID_ONLY to reject buggy clients or hacking attempts. DID_NONE
   is only useful, when you want to hide dialog-tracking from the users
   (preventing the DID Record-Route cookie).

   The supported modes are:
     * 0 - DID_ONLY - the match is done exclusively based on DID;
     * 1 - DID_FALLBACK - the match is first tried based on DID and if not
       present, it will fall back to SIP matching;
     * 2 - DID_NONE - the match is done exclusively based on SIP elements;
       no DID information is added in RR.

   Default value is “0 (DID_ONLY)”.

   Example 1.11. Set dlg_match_mode parameter
...
modparam("dialog", "dlg_match_mode", 1)
...

6.12. detect_spirals (integer)

   Whether spirals (i.e., messages routed through the proxy multiple
   times) should be detected.

   If set to 0, spirals will not be detected and result in the generation
   of a new, possibly dangling dialog structure per occurring spiral. If
   set to 1, spirals are detected and internally mapped to existing dialog
   structures.

   Default value is 1.

   Example 1.12. Set detect_spirals parameter
...
modparam("dialog", "detect_spirals", 1)
...

6.13. db_url (string)

   In order to store information about dialogs in a database, a database
   URL must be specified.

   Default value is “mysql://kamailio:kamailiorw@localhost/kamailio”.

   Example 1.13. Set db_url parameter
...
modparam("dialog", "db_url", "dbdriver://username:password@dbhost/dbname")
...

6.14. db_mode (integer)

   Mode of synchronisation of dialog information from memory to an
   underlying database (if desired):

   The supported modes are:
     * 0 - NO_DB - the memory content is not flushed into DB;
     * 1 - REALTIME - any dialog information changes will be reflected
       into the database immediately.
     * 2 - DELAYED - the dialog information changes will be flushed into
       DB periodically, based on a timer routine.
     * 3 - SHUTDOWN - the dialog information will be flushed into DB only
       at shutdown - no runtime updates.

   Default value is “0”.

   Example 1.14. Set db_mode parameter
...
modparam("dialog", "db_mode", 1)
...

6.15. db_update_period (integer)

   The interval (seconds) at which to update dialogs' information, if the
   server is configured to store the dialog information at a given
   interval. A too short interval will generate intensive database
   operations, while an excessively long one will miss dialogs with a
   short lifetime.

   Default value is “60” seconds.

   Example 1.15. Set db_update_period parameter
...
modparam("dialog", "db_update_period", 120)
...

6.16. db_fetch_rows (integer)

   The number of the rows to be fetched at once from database when loading
   the dialog records at startup from the database. This value can be used
   to tune the load time at startup. For 1MB of private memory (default),
   it should be below 400. The database driver must support the
   fetch_result() capability. A value of 0 means the database fetch is not
   limited.

   Default value is “200”.

   Example 1.16. Set db_fetch_rows parameter
...
modparam("dialog", "db_fetch_rows", 500)
...

6.17. db_skip_load (integer)

   Set db_skip_load to 1, to skip the loading of dialog data from the
   database.

   Default value is “0” ( not skipped ).

   Example 1.17. Set db_skip_load parameter
...
modparam("dialog", "db_skip_load", 1)
...

6.18. table_name (string)

   Database table name used for storing dialog information.

   Default value is “dialog”.

   Example 1.18. Set table_name parameter
...
modparam("dialog", "table_name", "my_dialog")
...

6.19. call_id_column (string)

   The column name in the database to store the dialog call-id.

   Default value is “callid”.

   Example 1.19. Set call_id_column parameter
...
modparam("dialog", "call_id_column", "callid_c_name")
...

6.20. from_uri_column (string)

   The column name in the database to store the caller's SIP address
   (URI).

   Default value is “from_uri”.

   Example 1.20. Set from_uri_column parameter
...
modparam("dialog", "from_uri_column", "from_uri_c_name")
...

6.21. from_tag_column (string)

   The column name in the database to store the From header tag from the
   INVITE request.

   Default value is “from_tag”.

   Example 1.21. Set from_tag_column parameter
...
modparam("dialog", "from_tag_column", "from_tag_c_name")
...

6.22. to_uri_column (string)

   The column name in the database to store the callee's SIP address
   (URI).

   Default value is “to_uri”.

   Example 1.22. Set to_uri_column parameter
...
modparam("dialog", "to_uri_column", "to_uri_c_name")
...

6.23. to_tag_column (string)

   The column name in the database to store the To header tag from the 200
   OK response to the INVITE request, if present.

   Default value is “to_tag”.

   Example 1.23. Set to_tag_column parameter
...
modparam("dialog", "to_tag_column", "to_tag_c_name")
...

6.24. from_cseq_column (string)

   The column name in the database to store the Cseq from caller side.

   Default value is “caller_cseq”.

   Example 1.24. Set from_cseq_column parameter
...
modparam("dialog", "from_cseq_column", "from_cseq")
...

6.25. to_cseq_column (string)

   The column name in the database to store the cseq from callee side.

   Default value is “callee_cseq”.

   Example 1.25. Set to_cseq_column parameter
...
modparam("dialog", "to_cseq_column", "to_cseq")
...

6.26. from_route_column (string)

   The column name in the database to store the route records from caller
   side (proxy to caller).

   Default value is “caller_route_set”.

   Example 1.26. Set from_route_column parameter
...
modparam("dialog", "from_route_column", "rroute_from")
...

6.27. to_route_column (string)

   The column name in the database to store the route records from callee
   side (proxy to callee).

   Default value is “callee_route_set”.

   Example 1.27. Set to_route_column parameter
...
modparam("dialog", "to_route_column", "rroute_to")
...

6.28. from_contact_column (string)

   The column name in the database to store the caller's contact uri.

   Default value is “caller_contact”.

   Example 1.28. Set from_contact_column parameter
...
modparam("dialog", "from_contact_column", "from_contact_uri")
...

6.29. to_contact_column (string)

   The column name in the database to store the callee's contact uri.

   Default value is “callee_contact”.

   Example 1.29. Set to_contact_column parameter
...
modparam("dialog", "to_contact_column", "to_contact_uri")
...

6.30. from_sock_column (string)

   The column name in the database to store the information about the
   local interface receiving the traffic from caller.

   Default value is “caller_sock”.

   Example 1.30. Set from_sock_column parameter
...
modparam("dialog", "from_sock_column", "socket_from")
...

6.31. to_sock_column (string)

   The column name in the database to store information about the local
   interface receiving the traffic from callee.

   Default value is “callee_sock”.

   Example 1.31. Set to_sock_column parameter
...
modparam("dialog", "to_sock_column", "socket_to")
...

6.32. h_id_column (string)

   The column name in the database to store the dialogs' hash id
   information.

   Default value is “hash_id”.

   Example 1.32. Set h_id_column parameter
...
modparam("dialog", "h_id_column", "hash_id_c_name")
...

6.33. h_entry_column (string)

   The column name in the database to store the dialog's hash entry
   information.

   Default value is “hash_entry”.

   Example 1.33. Set h_entry_column parameter
...
modparam("dialog", "h_entry_column", "h_entry_c_name")
...

6.34. state_column (string)

   The column name in the database to store the dialog's state
   information.

   Default value is “state”.

   Example 1.34. Set state_column parameter
...
modparam("dialog", "state_column", "state_c_name")
...

6.35. start_time_column (string)

   The column name in the database to store the dialog's start time
   information.

   Default value is “start_time”.

   Example 1.35. Set start_time_column parameter
...
modparam("dialog", "start_time_column", "start_time_c_name")
...

6.36. timeout_column (string)

   The column name in the database to store the dialog's timeout.

   Default value is “timeout”.

   Example 1.36. Set timeout_column parameter
...
modparam("dialog", "timeout_column", "timeout_c_name")
...

6.37. sflags_column (string)

   The column name in the database to store the dialog script flags.

   Default value is “sflags”.

   Example 1.37. Set sflags_column parameter
...
modparam("dialog", "sflags_column", "s_flags")
...

6.38. toroute_name_column (string)

   The column name in the database to store the index of the route to be
   executed at timeout.

   Default value is “toroute_name”.

   Example 1.38. Set toroute_name_column parameter
...
modparam("dialog", "toroute_name_column", "timeout_route")
...

6.39. vars_table_name (string)

   If you want to store the dialog variables (“$dlg_var(name)”) for a
   dialog in a database a table name must be specified.

   Default value is “dialog_vars”.

   Example 1.39. Set vars_table_name parameter
...
modparam("dialog", "vars_table_name", "my_dialog_vars")
...

6.40. vars_h_id_column (string)

   The column name in the database to store the dialog's hash id
   information (as a reference to the dialog table).

   Default value is “hash_id”.

   Example 1.40. Set vars_h_id_column parameter
...
modparam("dialog", "vars_h_id_column", "vars_h_id_name")
...

6.41. vars_h_entry_column (string)

   The column name in the database to store the dialog's hash entry
   information (as a reference to the dialog table).

   Default value is “hash_entry”.

   Example 1.41. Set vars_h_entry_column parameter
...
modparam("dialog", "vars_h_entry_column", "vars_h_entry_name")
...

6.42. vars_key_column (string)

   The column name in the database to store the names (keys) of a dialog
   variable.

   Default value is “dialog_key”.

   Example 1.42. Set vars_key_column parameter
...
modparam("dialog", "vars_key_column", "vars_key_name")
...

6.43. vars_value_column (string)

   The column name in the database to store the values of a dialog
   variable.

   Default value is “dialog_value”.

   Example 1.43. Set vars_value_column parameter
...
modparam("dialog", "vars_value_column", "vars_value_name")
...

6.44. profiles_with_value (string)

   List of names for profiles with values, separated with semi-colon ";".

   Default value is “empty”.

   Example 1.44. Set profiles_with_value parameter
...
modparam("dialog", "profiles_with_value", "caller ; my_profile")
...

6.45. profiles_no_value (string)

   List of names for profiles without values, separated with semi-colon
   ";".

   Default value is “empty”.

   Example 1.45. Set profiles_no_value parameter
...
modparam("dialog", "profiles_no_value", "inbound ; outbound")
...

6.46. bridge_controller (string)

   SIP address to be used in From header when initiating a call bridge.

   Default value is “sip:controller@kamailio.org”.

   Example 1.46. Set bridge_controller parameter
...
modparam("dialog", "bridge_controller", "sip:ctd@kamailio.org")
...

6.47. bridge_contact (string)

   SIP address to be used in Contact header when doing a call bridge.

   Default value is “sip:controller@kamailio.org:5060”.

   Example 1.47. Set bridge_contact parameter
...
modparam("dialog", "bridge_contact", "sip:ctd@127.0.0.1:5060")
...

6.48. initial_cbs_inscript (int)

   If the initial dialog callbacks (i.e., DLGCB_CREATED and
   DLGCB_SPIRALED) should be executed in-script or post-script. If
   dlg_manage() is not used, the setting of this parameter does not
   matter; otherwise, initial callbacks will be executed directly after
   dlg_manage() is called if this parameter is enabled. If it is disabled,
   initial callback execution will be postponed until configuration script
   execution completes.

   The supported values are:
     * 0 - POST-SCRIPT - execute initial callbacks after the script
       completes;
     * 1 - IN-SCRIPT - execute initial callbacks during script execution,
       i.e., right after dlg_manage() is called;

   Default value is “1”.

   Example 1.48. Set initial_cbs_inscript parameter
...
modparam("dialog", "initial_cbs_inscript", 0)
...

6.49. send_bye (int)

   If set to 1, BYE requests will be sent out for each dialog that timed
   out. It is an alternative to $dlg_ctx(timeout_bye)=1 for all dialogs.

   Default value is “0”.

   Example 1.49. Set send_bye parameter
...
modparam("dialog", "send_bye", 1)
...

6.50. dlg_filter_mode (int)

   Set dialog fitering mode, which can specify what dialogs are processed.
   Its value can be a combination (the sum) of following flags:
     * 1 - do not send keepalives and do not execute timeout function if
       dialog is not local (if the associated bind address is not a local
       socket).

   Default value is “0”.

   Example 1.50. Set dlg_filter_mode parameter
...
modparam("dialog", "dlg_filter_mode", 1)
...

6.51. wait_ack (int)

   If set to 1, dialog will be kept a bit longer in memory in order to
   absorb the ACK negative replies of initial INVITE. If not, the dialog
   is destroyed when negative reply is sent out (less internal
   complexity).

   Default value is “1”.

   Example 1.51. Set wait_ack parameter
...
modparam("dialog", "wait_ack", 0)
...

6.52. ka_timer (int)

   Keep-alive timer step - how often to execute the callback to send
   dialog keep alives (SIP OPTIONS requests within dialog). The value
   represents the number of seconds.

   Default value is “0” (no keep alive).

   Example 1.52. Set ka_timer parameter
...
modparam("dialog", "ka_timer", 10)
...

6.53. ka_interval (int)

   The interval between keep alives within dialog (SIP OPTIONS requests),
   sent to caller or callee. The keep alive request will be sent by the
   first callback fired by KA timer after the ka_interval elapsed from
   dialog setup or previous keep-alive. The value represents the number of
   seconds.

   If the requests times out (generating a 408) or if the UA responds with
   481 the lifetime is set to 10 seconds. When lifetime expires the dialog
   will be terminated. Any other response (including error responses) will
   reset the timers.

   Default value is “0” (no keep alive). The lowest settable interval is
   30 seconds.

   Example 1.53. Set ka_interval parameter
...
modparam("dialog", "ka_interval", 300)
...

6.54. ka_failed_limit (int)

   The number of failed keep-alive requests that is accepted before
   generating a dialog timeout.

   Default value is “1”.

   Example 1.54. Set ka_failed_limit parameter
...
modparam("dialog", "ka_failed_limit", 5)
...

6.55. timeout_noreset (int)

   If set to 1, the dialog timeout won't be reset each time a sequential
   request is processed. It is an alternative to
   dlg_set_property("timeout-noreset") for all dialogs.

   Default value is “0”.

   Example 1.55. Set timeout_noreset parameter
...
modparam("dialog", "timeout_noreset", 1)
...

6.56. timer_procs (int)

   If set to 1, the dialog module will start a separate dialog timer
   process to execute dialog timeout tasks. The default is to use the core
   timer process.

   Default value is “0” (use core timer process).

   Example 1.56. Set timer_procs parameter
...
modparam("dialog", "timer_procs", 1)
...

6.57. enable_dmq (int)

   If set to 1, the dialog will be synced via dmq. For now, only very
   basic dialog info is shared, just enough to have synced profiles.
   Notably, it is not possible to send in-dialog requests on any but the
   original proxy instance.

   Default value is “0”.

   Example 1.57. Set enable_dmq parameter
...
modparam("dialog", "enable_dmq", 1)
...

6.58. track_cseq_updates (int)

   Enable the callbacks for tracking if CSeq number needs to be updated.
   It is the case when the INVITE has to be authenticated to downstream
   provider using uac_auth() from uac module.

   This is done only for requests in downstream direction. The CSeq
   difference is stored in $dlg_var(cseq_diff), be sure this variable is
   not overwritten via config operation.

   Default value is “0” (disabled).

   Example 1.58. Set track_cseq_updates parameter
...
modparam("dialog", "track_cseq_updates", 1)
...

6.59. lreq_callee_headers (string)

   SIP headers to be added when sending local generated requests (e.g.,
   BYE) to callee. It can be useful when you use topoh module with call-id
   masking (see the docs of topoh module).

   Default value is “null”.

   Example 1.59. Set lreq_callee_headers parameter
...
modparam("dialog", "lreq_callee_headers", "TH: dlh\r\n")
...

6.60. event_callback (str)

   The name of the function in the kemi configuration file (embedded
   scripting language such as Lua, Python, ...) to be executed instead of
   event_route[...] blocks.

   The function receives a string parameter with the name of the event,
   the values are: 'dialog:start', 'dialog:end', 'dialog:failed'. It is
   also executed if '$dlg_ctx(timeout_route)' is set, the callback
   function being executed with the variable value as parameter.

   Default value is 'empty' (no function is executed for events).

   Example 1.60. Set event_callback parameter
...
modparam("dialog", "event_callback", "ksr_dialog_event")
...
-- event callback function implemented in Lua
function ksr_dialog_event(evname)
        KSR.info("===== dialog module triggered event: " .. evname .. "\n");
        return 1;
end
...

6.61. h_id_start (int)

   Set the offset to be used for generating dialog internal hash id. If
   set to -1, the h_id_start is set to the value of the server_id global
   parameter.

   Default value is “0”.

   Example 1.61. Set h_id_start parameter
...
modparam("dialog", "h_id_start", 5)
...

6.62. h_id_step (int)

   Set the step to increment the dialog internal hash id.

   If the value is greater than 1, the internal hash id is generated with
   the rule: h_id_start + N * h_id_step. The first value of N is randomly
   selected at startup, then incremented by 1 for each new dialog. Setting
   h_id_start and h_id_step to non-default values should be done when
   using dlg_db_load_callid(...) or dlg_db_load_extra() to load dialog
   records generated by another Kamailio instance. Pay attention to ensure
   that those Kamailio instances are not going to generate overlapping
   dialog hash id values by using different h_id_start and the same
   h_id_step (h_id_step has to be greater than the maximum value of
   h_id_start).

   Default value is “1”.

   Example 1.62. Set h_id_step parameter
...
modparam("dialog", "h_id_step", 10)
...

6.63. keep_proxy_rr (string)

   Whether to keep the record-route header added by the proxy. When
   enabled, it will keep this proxy's record-route header from the reply.
   The result is that generated requests like the BYE from the dlg_end_dlg
   mi function will pass through the proxy (looped).

   Valid values are:
     * 0 - Don't keep any proxy Record-Route headers
     * 1 - Keep Record-route headers for the callee leg
     * 2 - Keep Record-route headers for the caller leg
     * 3 - Keep Record-route headers for both legs

   Default value is “0”.

   Example 1.63. Set dlg_keep_proxy_rr parameter
...
modparam("dialog", "keep_proxy_rr", 1)
...

6.64. bye_early_code (int)

   This parameter defines the reply-code being used for dialogs being
   terminated in early stage (e.g. before 200 OK/ACK).
   Default value is “480”.

   Example 1.64. Set bye_early_code parameter
...
modparam("dialog", "bye_early_code", 503)
...

6.65. bye_early_reason (string)

   This parameter defines the reply-reason being used for dialogs being
   terminated in early stage (e.g. before 200 OK/ACK).
   Default value is “Temporarily Unavailable”.

   Example 1.65. Set bye_early_reason parameter
...
modparam("dialog", "bye_early_reason", "Call terminated")
...

6.66. dlg_ctxiuid_mode (int)

   Set dialog context iuid mode, which can specify additional cases when
   the internal unique id should be set:
     * 1 - set it when processing CANCEL requests.

   Default value is “0”.

   Example 1.66. Set dlg_ctxiuid_mode parameter
...
modparam("dialog", "dlg_ctxiuid_mode", 1)
...

6.67. debug_variables (int)

   Activate additional debugging for printing internal lists for dialog
   variables. This output is only visible at debug log level and should
   only be used for debugging. By default it is deactivated.

   Default value is “0”.

   Example 1.67. Set debug_variables parameter
...
modparam("dialog", "debug_variables", 1)
...

7. Functions

   7.1. set_dlg_profile(profile[, value])
   7.2. unset_dlg_profile(profile[, value])
   7.3. is_in_profile(profile[, value])
   7.4. get_profile_size(profile[, value], size)
   7.5. dlg_isflagset(flag)
   7.6. dlg_setflag(flag)
   7.7. dlg_resetflag(flag)
   7.8. dlg_bye(side)
   7.9. dlg_refer(side, address)
   7.10. dlg_manage()
   7.11. dlg_bridge(from, to, op)
   7.12. dlg_get(callid, ftag, ttag)
   7.13. dlg_get_var(callid, ftag, ttag, name, dst)
   7.14. dlg_set_var(callid, ftag, ttag, name, value)
   7.15. is_known_dlg()
   7.16. dlg_set_timeout(timeout [, h_entry, h_id])
   7.17. dlg_set_timeout_by_profile(profile, [value], timeout)
   7.18. dlg_set_property(attr)
   7.19. dlg_remote_profile(cmd, profile, value, uid, expires)
   7.20. dlg_set_ruri()
   7.21. dlg_db_load_callid(cival)
   7.22. dlg_db_load_extra()
   7.23. dlg_reset_property(attr)
   7.24. dlg_req_within(side, method, [headers], [content_type, content])

7.1.  set_dlg_profile(profile[, value])

   Inserts the current dialog into a profile. Note that if the profile
   does not support values, they will be silently discarded. Also, there
   is no check for inserting the same dialog into the same profile
   multiple times.

   Meaning of the parameters is as follows:
     * profile - name of the profile to be added to;
     * value (optional) - string value to define the membership of the
       dialog in the profile. Note that the profile must support values.
       Pseudo-variables are supported.

   This function can be used from REQUEST_ROUTE, BRANCH_ROUTE, REPLY_ROUTE
   and FAILURE_ROUTE.

   Example 1.68. set_dlg_profile usage
...
set_dlg_profile("inbound_call");
set_dlg_profile("caller","$fu");
...

7.2.  unset_dlg_profile(profile[, value])

   Removes the current dialog from a profile.

   Meaning of the parameters is as follows:
     * profile - name of the profile to be removed from;
     * value (optional) - string value to define the belonging of the
       dialog to the profile - note that the profile must support values.
       Pseudo-variables are supported.

   This function can be used from BRANCH_ROUTE, REPLY_ROUTE and
   FAILURE_ROUTE.

   Example 1.69. unset_dlg_profile usage
...
unset_dlg_profile("inbound_call");
unset_dlg_profile("caller","$fu");
...

7.3.  is_in_profile(profile[, value])

   Checks if the current dialog belongs to a profile. If the profile is
   defined with values, then the check is also matching with the specific
   value provided as parameter.

   Note that if the profile is not defined with support for values, the
   value parameter will be silently discarded.

   Meaning of the parameters is as follows:
     * profile - name of the profile to be checked against;
     * value (optional) - string value to be matched during the check.
       Pseudo-variables are supported.

   This function can be used from REQUEST_ROUTE, BRANCH_ROUTE, REPLY_ROUTE
   and FAILURE_ROUTE.

   Example 1.70. is_in_profile usage
...
if (is_in_profile("inbound_call")) {
        log("this request belongs to an inbound call\n");
}
...
if (is_in_profile("caller","XX")) {
        log("this request belongs to a call of user XX\n");
}
...

7.4.  get_profile_size(profile[, value], size)

   Returns the number of dialogs belonging to a profile. If the profile
   supports values, the check can be reinforced to take into account a
   specific value, i.e. how many dialogs were inserted into the profile
   with a specific value. If no value is passed, only the membership of
   the dialog in the profile per se is checked. Note that if the profile
   does not support values, the value parameter will be silently
   discarded.

   Meaning of the parameters is as follows:
     * profile - name of the profile to get the size for;
     * value (optional) - string value to further restrict the check.
       Pseudo-variables are supported;
     * size - an AVP or script variable to return the profile size in.

   This function can be used from REQUEST_ROUTE, BRANCH_ROUTE, REPLY_ROUTE
   and FAILURE_ROUTE.

   Example 1.71. get_profile_size usage
...
if(get_profile_size("inbound_call","$avp(size)"))
    xlog("currently there are $avp(size) inbound calls\n");
...
if(get_profile_size("caller","$fu","$avp(size)"))
    xlog("currently, the user $fu has $avp(size) active outgoing calls\n");
...

7.5.  dlg_isflagset(flag)

   Check if the dialog flag is set or not.

   Meaning of the parameters is as follows:
     * flag - index of the flag - can be pseudo-variable.

   This function can be used from BRANCH_ROUTE, REQUEST_ROUTE,
   ONREPLY_ROUTE and FAILURE_ROUTE.

   Example 1.72. dlg_isflagset usage
...
if(dlg_isflagset("1"))
{
    ...
}
...

7.6.  dlg_setflag(flag)

   Set a dialog flag.

   Meaning of the parameters is as follows:
     * flag - index of the flag - can be pseudo-variable.

   This function can be used from BRANCH_ROUTE, REQUEST_ROUTE,
   ONREPLY_ROUTE and FAILURE_ROUTE.

   Example 1.73. dlg_setflag usage
...
dlg_setflag("1");
...

7.7.  dlg_resetflag(flag)

   Reset the dialog flag.

   Meaning of the parameters is as follows:
     * flag - index of the flag - can be pseudo-variable.

   This function can be used from BRANCH_ROUTE, REQUEST_ROUTE,
   ONREPLY_ROUTE and FAILURE_ROUTE.

   Example 1.74. dlg_resetflag usage
...
dlg_resetflag("1");
...

7.8.  dlg_bye(side)

   Send BYE to parties of a dialog or - if in early stage - a CANCEL to
   the B-Party and a SIP response to the A-Party (as defined in
   bye_early_code / bye_early_reason).

   Meaning of the parameters is as follows:
     * side - where to send the BYE. It can be: 'caller', 'callee', or
       'all' (send to both sides).

   This function can be used from ANY_ROUTE.

   Example 1.75. dlg_bye usage
...
dlg_bye("all");
...

7.9.  dlg_refer(side, address)

   Refer the 'side' to a new SIP 'address'.

   Meaning of the parameters is as follows:
     * side - which side of the dialog to REFER. It can be: 'caller' or
       'callee'.
     * address - SIP address to refer to.

   This function can be used from BRANCH_ROUTE, REQUEST_ROUTE,
   ONREPLY_ROUTE and FAILURE_ROUTE.

   Example 1.76. dlg_refer usage
...
dlg_refer("caller", "sip:announcement@kamailio.org");
...

7.10.  dlg_manage()

   Process current SIP request with dialog module. It is an alternative to
   setting dialog flag for initial INVITE and Route-parameter-callback
   execution for within-dialog requests.

   This function can be used from REQUEST_ROUTE.

   Example 1.77. dlg_manage usage
...
modparam("dialog", "default_timeout", 100)
...
request_route {
...
    if(is_method("INVITE") && !has_totag())
    {
        $dlg_ctx(timeout_route) = "DLGTIMEOUT";
        $dlg_ctx(timeout_bye) = 1;
    }
    dlg_manage();
...
}
...

7.11.  dlg_bridge(from, to, op)

   Bridge 'from' SIP address to 'to' SIP address via outbound proxy 'op'.

   Meaning of the parameters is as follows:
     * from - SIP address of first side to call.
     * to - SIP address to refer “from” to.
     * op - outbound proxy SIP address.

   This function can be used from BRANCH_ROUTE, REQUEST_ROUTE,
   ONREPLY_ROUTE and FAILURE_ROUTE.

   Example 1.78. dlg_bridge usage
...
dlg_bridge("sip:user@kamailio.org", "sip:annoucement@kamailio.org",
   "sip:kamailio.org:5080");
...

7.12.  dlg_get(callid, ftag, ttag)

   Search and set current dialog based on Call-ID, From-Tag and To-Tag
   parameters.

   Meaning of the parameters is as follows:
     * callid - SIP call-id.
     * ftag - SIP From tag.
     * ttag - SIP To tag (it can be empty string to match a dialog during
       call setup (eg., match for CANCEL)).

   This function can be used from BRANCH_ROUTE, REQUEST_ROUTE,
   ONREPLY_ROUTE and FAILURE_ROUTE.

   Example 1.79. dlg_get usage
...
if(dlg_get("abcdef", "123", "456"))
{
        dlg_bye("all");
}
...

7.13.  dlg_get_var(callid, ftag, ttag, name, dst)

   Get dlg_var of another dialog value based on Call-ID, From-Tag and
   To-Tag parameters.

   Meaning of the parameters is as follows:
     * callid - SIP call-id.
     * ftag - SIP From tag.
     * ttag - SIP To tag. Use "" value to indicate early dialog.
     * name - key name of the $dlg_var.
     * dst - pv to store the value of $dlg_var(name).

   This function can be used from BRANCH_ROUTE, REQUEST_ROUTE,
   ONREPLY_ROUTE and FAILURE_ROUTE.

   Example 1.80. dlg_get_var usage
...
if(dlg_get_var("$var(ci)", "$var(ft)", "456", "test", "$var(tmp)"))
{
        xdbg("$$dlg_var(test):$var(tmp)\n");
}
...

7.14.  dlg_set_var(callid, ftag, ttag, name, value)

   Set dlg_var of another dialog value based on Call-ID, From-Tag and
   To-Tag parameters.

   Meaning of the parameters is as follows:
     * callid - SIP call-id.
     * ftag - SIP From tag.
     * ttag - SIP To tag. Use "" value to indicate early dialog.
     * name - key name of the $dlg_var.
     * value - string value to store at $dlg_var(name).

   This function can be used from BRANCH_ROUTE, REQUEST_ROUTE,
   ONREPLY_ROUTE and FAILURE_ROUTE.

   Example 1.81. dlg_set_var usage
...
if(dlg_set_var("$var(ci)", "$var(ft)", "456", "test", "$var(tmp)"))
{
        xdbg("set $$dlg_var(test):$var(tmp)\n");
}
# you can set vars in early dialog too
if(dlg_set_var("$var(ci)", "$var(ft)", "", "test", "$var(tmp)"))
{
        xdbg("set $$dlg_var(test):$var(tmp)\n");
}
...

7.15.  is_known_dlg()

   This function checks if the current SIP message being processed belongs
   to any transaction within an active dialog that the dialog module is
   currently tracking. This is a check for tracking of any kind, without
   regard to profiles.

   This function has numerous potential applications, among which is that
   it can be used to strengthen security for loose-routing sequential
   (in-dialog) requests or responses to them, as by providing a
   preventative check against spoofing on the proxy level instead of
   leaving the issue purely to the receiving UA.

   This function can be used from REQUEST_ROUTE, BRANCH_ROUTE, REPLY_ROUTE
   and FAILURE_ROUTE.

   Example 1.82. is_known_dlg() usage
...
if(!uri == myself) {
        if(is_known_dlg()) {
                xlog("Request $rm from $ci is in-dialog\n");
        }
}
...

7.16.  dlg_set_timeout(timeout [, h_entry, h_id])

   Set the dialog timeout. Dialog timeout will be updated if it was
   already set. If h_entry and h_id parameters are not provided, the
   dialog will be searched based on (callid, fromtag, totag) of currently
   processed SIP message.

   Meaning of the parameters is as follows:
     * timeout - the interval in seconds after which the dialog will time
       out.
     * h_entry - h_entry value of the iternal dialog identifier.
     * h_id - h_id value if the internal dialog identifier.

   This function can be used from ANY_ROUTE.

   Example 1.83. dlg_set_timeout usage
...
if(dlg_set_timeout("180", "123", "456"))
{
    ...
}
...

7.17.  dlg_set_timeout_by_profile(profile, [value], timeout)

   Like dlg_set_timeout(), but simultaneously sets the timeout of all
   dialogs in a given profile. Can be constrained by profile value.

   Meaning of the parameters is as follows:
     * profile - The dialog profile across which to apply the timeout.
       value (optional) - The profile value to use when applying the
       dialog timeout.
       timeout - the interval in seconds after which the dialog will time
       out.

   This function can be used from ANY_ROUTE.

   Example 1.84. dlg_set_timeout_by_profile usage
...
# All dialogs belonging to user abc123 (tracked via set_dlg_profile())
# will be timed out in 3 seconds.

dlg_set_timeout_by_profile("users", "abc123", "3");
...

7.18.  dlg_set_property(attr)

   Set a dialog property - an attribute that enable/disable various
   behaviours (e.g., sending keep alive requests).

   Meaning of the parameters is as follows:
     * attr - name of property. It can be:
          + 'ka-src' - send keep alive OPTION requests to caller
          + 'ka-dst' - send keep alive OPTION requests to callee
          + 'timeout-noreset' - don't reset timeout on in-dialog messages
            reception

   If keep alive is enabled for a dialog, the module will send SIP OPTIONS
   requests with CSeq lower or equal than last request within dialog, with
   the scope of detecting if the destination is still in the call. If the
   keep alive request results in a local timeout or '481 Call
   Leg/Transaction Does Not Exist', then the dialog is ended from the
   server.

   If 'timeout-noreset' is set, dialog timeout won't be reset upon
   reception of in-dialog messages (default behavior).

   This function can be used from ANY_ROUTE.

   Example 1.85. dlg_set_property usage
...
dlg_set_property("ka-src");
dlg_set_property("ka-dst");
dlg_set_property("timeout-noreset");
...

7.19.  dlg_remote_profile(cmd, profile, value, uid, expires)

   Manage remote profile via config file. A remote profile item is
   considered when the dialog is not managed by this server instance. The
   notification to add/remove can be received via SIP or a RPC command,
   the operation can be then triggered from configuration file. This
   should allow counting active dialogs in a profile that are managed by
   multiple SIP server instances.

   Meaning of the parameters is as follows:
     * cmd - the operations to do: add - add an item in profile; rm -
       remove an item from profile
     * profile - name of profile
     * value - value for profile (if no value is needed for that profile,
       use an empty string.
     * expires - absolute time (unix timestamp) when this profile item
       should be removed automatically (time based), if still in the
       profile

   This function can be used from ANY_ROUTE.

   Example 1.86. dlg_remote_profile usage
...
$var(exp) = 3600 + $Ts;
dlg_remote_profile("add", "caller", "test", "$sruid", "$var(exp)");
...

7.20.  dlg_set_ruri()

   This function sets the R-URI with the corresponding endpoint address
   stored in dialog structure (i.e., its Contact field).

   This function can be used from ANY_ROUTE.

   Example 1.87. dlg_set_ruri() usage
...
if(has_totag() and is_present_hf("Route") and uri==myself ) {
        if(dlg_set_ruri()) {
                xlog("Request URI changed from [$ou] to dlg value: [$ru]\n");
        }
}
...

7.21.  dlg_db_load_callid(cival)

   Load dialog record from database matching on Call-Id provided as
   parameter.

   This function can be used from ANY_ROUTE.

   Example 1.88. dlg_db_load_callid() usage
...
if(has_totag()) {
    if(!is_known_dlg()) {
        dlg_db_load_callid("$ci");
            if(!is_known_dlg()) {
            xlog("no dialog found with callid: $ci\n");
        }
    }
}
...

7.22.  dlg_db_load_extra()

   Load all dialog records from database that are not in memory of the
   current Kamailio instance.

   This function can be used from ANY_ROUTE.

   Example 1.89. dlg_db_load_extra() usage
...
if(has_totag()) {
    if(!is_known_dlg()) {
        dlg_db_load_extra();
            if(!is_known_dlg()) {
            xlog("no dialog found with callid: $ci\n");
        }
    }
}
...

7.23.  dlg_reset_property(attr)

   Reset a dialog property - an attribute that enable/disable various
   behaviours (e.g., sending keep alive requests).

   Meaning of the parameters is as follows:
     * attr - name of property. It can be:
          + 'ka-src' - send keep alive OPTION requests to caller
          + 'ka-dst' - send keep alive OPTION requests to callee
          + 'timeout-noreset' - don't reset timeout on in-dialog messages
            reception

   This function can be used from ANY_ROUTE.

   Example 1.90. dlg_reset_property usage
...
dlg_reset_property("ka-src");
dlg_reset_property("ka-dst");
dlg_reset_property("timeout-noreset");
...

7.24.  dlg_req_within(side, method, [headers], [content_type, content])

   Sends an in-dialog SIP Request with method to a party of a dialog
   indicated by the side parameter.

   Meaning of the parameters is as follows:
     * side - where to send the request. It can be: 'caller', 'callee', or
       'all' (send to both sides).
     * method - Method of the request
     * headers (optional) - additional headers to be added to the request.
     * content_type (optional) - Content-Type of the request body - will
       be added as Content-Type Header.
     * content (optional) - Content to be sent as body.

   This function can be used from ANY_ROUTE.

   Example 1.91. dlg_req_within usage
...
        # Send a simple request:
        dlg_req_within("all", "OPTIONS");
...
        # Send a simple request with extra headers:
        dlg_req_within("caller", "OPTIONS", "X-Info: Bandwidth granted\r\nX-Info
-2: Go ahead\r\n");
...
        # Send a simple request with body:
        dlg_req_within("caller", "UPDATE", "application/sdp", "...some SDP...");
...
        # Send a simple request with extra headers and body:
        dlg_req_within("callee", "INFO", "X-Info: Bandwidth granted\r\n", "appli
cation/sdp", "...some SDP...");
...

8. Statistics

   8.1. active_dialogs
   8.2. early_dialogs
   8.3. processed_dialogs
   8.4. expired_dialogs
   8.5. failed_dialogs

8.1. active_dialogs

   Returns the number of current active dialogs (may be confirmed or not).

8.2. early_dialogs

   Returns the number of early dialogs.

8.3. processed_dialogs

   Returns the total number of processed dialogs (terminated, expired or
   active) from the startup.

8.4. expired_dialogs

   Returns the total number of expired dialogs from the startup.

8.5. failed_dialogs

   Returns the number of failed dialogs.

9. RPC Commands

   9.1. dlg.list
   9.2. dlg.list_ctx
   9.3. dlg.list_match
   9.4. dlg.list_match_ctx
   9.5. dlg.dump_file
   9.6. dlg.dlg_list
   9.7. dlg.dlg_list_ctx
   9.8. dlg.terminate_dlg
   9.9. dlg.end_dlg
   9.10. dlg.set_state
   9.11. dlg.profile_get_size
   9.12. dlg.profile_list
   9.13. dlg.bridge_dlg
   9.14. dlg.stats_active
   9.15. dlg.is_alive
   9.16. dlg.briefing

9.1. dlg.list

   Lists the description of all dialogs (active calls).

   Name: dlg.list

   RPC Command Format:
...
kamcmd dlg.list
...

9.2. dlg.list_ctx

   The same as the “dlg_list” but including in the dialog description the
   associated context from modules sitting on top of the dialog module.

   Name: dlg.list_ctx

   RPC Command Format:
...
kamcmd dlg.list_ctx
...

9.3. dlg.list_match

   Lists the details of matching dialogs. The paramters specify the
   matching key, operator, value and optionally a limit of matched
   dialogs.

   Name: dlg.list_match

   Parameters:
     * mkey - matching key. It can be: 'ruri' - match against R-URI of the
       dialog; 'furi' - match against From header URI of the dialog;
       'turi' - match against the To header URI of the dialog; 'callid' -
       match against Call-Id value; 'start_ts' - match against start
       timestamp.
     * mop - matching operator. It can be: 'eq' - match using string
       comparison; 're' - match using regular expression; 'sw' - match
       using starts-with (prefix) comparison; 'gt' - match using integer
       greater comparison; 'lt' - match using integer lesser comparison.
       Integer comparison can be used only with 'start_ts' key.
     * mval - matching value.

   RPC Command Format:
...
kamcmd dlg.list_match furi eq sip:alice@test.com 2
...
kamcmd dlg.list_match furi sw sip:alice@
...
kamcmd dlg.list_match start_ts gt s:1641550904
...

9.4. dlg.list_match_ctx

   Similar to “dlg.list_match”, but including in the attributes associated
   with the dialog context from modules sitting on top of the dialog
   module.

   Name: dlg.list_match_ctx

   RPC Command Format:
...
kamcmd dlg.list_match_ctx furi sw sip:alice@
...

9.5. dlg.dump_file

   Dump all dialogs in a json file. (much faster than dlg.list)

   Name: dlg.dump_file

   Parameters:
     * file name output file name

   RPC Command Format:
...
kamcmd dlg.dump_file "/tmp/dlg.json"
...

9.6. dlg.dlg_list

   Lists the description of one dialog. The dialog identifiers are to be
   passed as parameter (callid and optionally fromtag).

   Name: dlg.dlg_list

   Parameters:
     * callid callid of the dialog to be listed.
     * from_tag from tag (as per initial request) of the dialog to be
       listed.

   RPC Command Format:
...
kamcmd dlg.dlg_list abcdrssfrs122444@192.168.1.1 AAdfeEFF33
...
kamcmd dlg.dlg_list abcdrssfrs122444@192.168.1.1
...

9.7. dlg.dlg_list_ctx

   The same as the “dlg.list_list” but including in the dialog description
   the associated context from modules sitting on top of the dialog
   module.

   Name: dlg.dlg_list_ctx

   Parameters: see “dlg_list”

   RPC Command Format:
...
kamcmd dlg.list_ctx abcdrssfrs122444@192.168.1.1 AAdfeEFF33
...
kamcmd dlg.list_ctx abcdrssfrs122444@192.168.1.1
...

9.8. dlg.terminate_dlg

   Terminates an ongoing dialog by sending BYE in both directions,
   matching the dialog on call-id, from tag and to tag.

   Name: dlg.terminate_dlg

   Parameters:
     * callid - callid of dialog to be terminated
     * from_tag - from tag of the dialog to terminated
     * to_tag - to tag of the dialog to terminated

   The command works only for confirmed dialogs.

   RPC Command Format:
                kamcmd dlg.terminate_dlg callid12345 fromtag123 totag123

9.9. dlg.end_dlg

   Terminates an ongoing dialog by sending BYE in both directions.

   Name: dlg.end_dlg

   Parameters:
     * h_entry - hash entry of the dialog in the internal dialog table
     * h_id - hash id of the dialog on the hash entry
     * extra_hdrs - (optional) string containg extra headers (full format)
       to be added to the BYE requests.

   The values for the h_entry and h_id can be obtained via the dlg_list
   RPC command.

   RPC Command Format:
...
kamcmd dlg.end_dlg 342 56
...

9.10. dlg.set_state

   Set state for the dialog matching the dialog on Call-ID, From-Tag and
   To-Tag.

   Name: dlg.kill_active_dlg

   Parameters:
     * callid - Call-ID of active dialog to kill
     * from_tag - From-Tag of active dialog to kill
     * to_tag - To-tag of active dialog to kill
     * state - The value for new state

   At this moment, the command targets the need to change from active
   dialogs (state 4) to terminated state (5), although it allows setting
   other state value. Be careful using with it, it can cause side effects
   and the terminated dialog is wiped out silently. Dialog ending
   functions are not executed, such as accounting end-of-call events,
   dialog-end events, module-generated BYE requests, etc. After executing
   the command, dialog remains in memory until execution of the recurring
   function in charge of removing old dialogs (a "dialog in delete state
   is too old" will then be logged).

   RPC Command Format:
...
kamcmd dlg.set_state callid12345 fromtag123 totag123 5
...

9.11. dlg.profile_get_size

   Returns the number of dialogs belonging to a profile. If the profile
   supports values, the check can be reinforced to take into account a
   specific value - how many dialogs were inserted into the profile with a
   specific value. If no value is passed, only the simply belonging of the
   dialog to the profile is checked. Note that if the profile does not
   support values, the value parameter will be silently discarded.

   Name: dlg.profile_get_size

   Parameters:
     * profile - name of the profile to get the value for.
     * value (optional)- string value to further restrict the check;

   RPC Command Format:
...
kamcmd dlg.dlg.profile_get_size inbound_calls
...

9.12. dlg.profile_list

   Lists all the dialogs belonging to a profile. If the profile supports
   values, the check can be reinforced to take into account a specific
   value, i.e. list only the dialogs that were inserted into the profile
   with that specific value. If no value is passed, all dialogs belonging
   to the profile will be listed. Note that if the profile does not
   supports values, this will be silently discarded.

   Name: dlg.profile_list

   Parameters:
     * profile - name of the profile to list the dialog for.
     * value (optional)- string value to further restrict the check;

   RPC Command Format:
...
kamcmd dlg.profile_list inbound_calls
...

9.13. dlg.bridge_dlg

   Bridge two SIP addresses into a call using INVITE(hold)-REFER-BYE
   mechanism.

   Name: dlg.bridge_dlg

   Parameters:
     * from - SIP address to initiate the call
     * to - SIP address to refer 'from' to
     * op (optional) - outbound proxy SIP address. If its value is set to
       '.' (dot), then it is ignored (like it would not have been
       provided).
     * body (optional) - SDP body for initial INVITE. If its value is set
       to '.' (dot), then it is ignored (like it would not have been
       provided). If body is not set via RPC command parameter, then an
       internal generated SDP with G711a and G711u is used. If its value
       is set to '' (empty string) or '_' (underline), then the INVITE is
       sent without an SDP body.

   RPC Command Format:
...
kamcmd dlg.bridge_dlg _from_ _to_ _op_
...

9.14. dlg.stats_active

   Get stats about active dialogs by scanning internal list of dialogs
   (not relying on core stats framework).

   Name: dlg.stats_active

   Parameters:
     * local_only (optional) - if not 0 then filter out non local dialogs
       (the receiving socket is not found locally, from C code point of
       view, the bind_addr info is not set).

   Returned fields
     * starting - initial INVITE has been processed, no ringing or 1xx has
       been received.
     * connecting - initial INVITE was forwarded and rining or 1xx has
       been received.
     * answering - initial INVITE received 200 OK, but ACK was not handled
       yet.
     * ongoing - ongoing active dialog, after the ACK was processed.
     * all - all active dialogs, respectively the sum of the above values.

   RPC Command Format:
...
kamcmd dlg.stats_active
...

9.15. dlg.is_alive

   Check whether a dialog matching the parameter is in confirmed state
   (answered and alive).

   Name: dlg.is_alive

   Parameters:
     * callid - callid of dialog
     * from_tag - from tag of the dialog
     * to_tag - to tag of the dialog

   This command will return error if dialog is not found or not confirmed
   state (answered).

   RPC Command Format:
...
kamcmd dlg.is_alive callid123 fromtag123 totag123
...

9.16. dlg.briefing

   Lists fewer attributes for dialog records in memory. The dialog hash
   entry and id are added always, the rest of them are a matter of 'attrs'
   parameter.

   Name: dlg.briefing

   Parameters:
     * attrs - (optional) a list of characters (flags) representing the
       fields to be added to the response. If it is missing, its default
       value is 'ftcFT' (note the characters are case sensitive).
       The characters can be:
          + f - From URI
          + t - To URI
          + c - Call-ID
          + F - From tag
          + T - To tag
          + I - Init time
          + S - Start time
          + E - End time
          + s - State

   RPC Command Example:
...
kamctl rpc dlg.briefing
...
kamctl rpc dlg.briefing "ft"
...

10. Exported Variables

   10.1. $DLG_count
   10.2. $DLG_status
   10.3. $DLG_lifetime
   10.4. $dlg(...)
   10.5. $dlg_ctx(...)
   10.6. $dlg_var(key)

10.1. $DLG_count

   Returns the number of current active dialogs (may be confirmed or not).

10.2. $DLG_status

   Returns the status of the dialog corresponding to the processed
   sequential request. This PV will be available only for sequential
   requests, after doing loose_route().

   Value may be:
     * NULL - Dialog not found.
     * 3 - Confirmed by a final reply but no ACK received yet.
     * 4 - Confirmed by a final reply and ACK received.
     * 5 - Dialog ended.

10.3. $DLG_lifetime

   Returns the duration (in seconds) of the dialog corresponding to the
   processed sequential request. The duration is calculated from the
   dialog confirmation and the current moment. This PV will be available
   only for sequential requests, after doing loose_route().

   NULL will be returned if there is no dialog for the request.

10.4. $dlg(...)

   Access to dialog attributes.

10.5. $dlg_ctx(...)

   Access to dialog context attributes.

10.6. $dlg_var(key)

   This is a read/write variable that can be used to store custom values
   assigned with a dialog (e.g. the URI of a billing-server, an assigned
   emergency-server). This pseudo-variable will be available only for
   subsequential requests after doing loose_route().

   Note: You will receive "NULL", if there is no dialog for this request.

11. Event Routes

   11.1. event_route[dialog:start]
   11.2. event_route[dialog:end]
   11.3. event_route[dialog:failed]

11.1. event_route[dialog:start]

   Executed when 200 OK reply for INVITE is processed.

11.2. event_route[dialog:end]

   Executed when the BYE for the call is processed or the dialog timed
   out.

11.3. event_route[dialog:failed]

   Executed when dialog is not completed (300 or greater reply code to
   INVITE).

Chapter 2. Developer Guide

   Table of Contents

   1. Available Functions

        1.1. register_dlgcb (dialog, type, cb, param, free_param_cb)
        1.2. terminate_dlg (dlg, hdrs)

1. Available Functions

   1.1. register_dlgcb (dialog, type, cb, param, free_param_cb)
   1.2. terminate_dlg (dlg, hdrs)

1.1.  register_dlgcb (dialog, type, cb, param, free_param_cb)

   Register a new callback to the dialog.

   Meaning of the parameters is as follows:
     * struct dlg_cell* dlg - dialog to register callback to. It may be
       NULL only for DLGCB_CREATED callback type, which is not a per
       dialog type.
     * int type - types of callbacks; more types may be registered for the
       same callback function; only DLGCB_LOADED and DLGCB_CREATED must be
       registered alone. Possible types:
          + DLGCB_LOADED
          + DLGCB_CREATED - called when a new dialog is created - it's a
            global type (not associated to any dialog)
          + DLGCB_FAILED - called when the dialog was negatively replied
            (non-2xx) - it's a per dialog type.
          + DLGCB_CONFIRMED_NA - called when the dialog is confirmed (2xx
            replied) but the setup-concluding ACK message from the caller
            is yet pending - it's a per dialog type.
          + DLGCB_CONFIRMED - called when the dialog is confirmed (2xx
            replied) and the setup-concluding ACK message from the caller
            has been seen - it's a per dialog type.
          + DLGCB_REQ_WITHIN - called when the dialog matches a sequential
            request (excluding setup-concluding ACK messages which are
            handled in DLGCB_CONFIRMED) - it's a per dialog type.
          + DLGCB_TERMINATED - called when the dialog is terminated via
            BYE - it's a per dialog type.
          + DLGCB_TERMINATED_CONFIRMED - called when response to a BYE
            request is received - it's a per dialog type.
          + DLGCB_EXPIRED - called when the dialog expires without
            receiving a BYE - it's a per dialog type.
          + DLGCB_EARLY - called when the dialog is created in an early
            state (18x replied) - it's a per dialog type.
          + DLGCB_RESPONSE_FWDED - called when the dialog matches a reply
            to the initial INVITE request - it's a per dialog type.
          + DLGCB_RESPONSE_WITHIN - called when the dialog matches a reply
            to a subsequent in dialog request - it's a per dialog type.
          + DLGCB_RPC_CONTEXT - called when the rpc dlg_list_ctx command
            is invoked - it's a per dialog type.
          + DLGCB_SPIRALED - called when the dialog matches a spiraling
            request - it's a per dialog type.
          + DLGCB_DESTROY
     * dialog_cb cb - callback function to be called. Prototype is: “void
       (dialog_cb) (struct dlg_cell* dlg, int type, struct dlg_cb_params *
       params); ”
     * void *param - parameter to be passed to the callback function.
     * param_free callback_param_free - callback function to be called to
       free the param. Prototype is: “void (param_free_cb) (void *param);”

1.2.  terminate_dlg (dlg, hdrs)

   Terminate a Dialog

   Meaning of parameters is as follows:
     * struct dlg_cell* dlg - dialog to terminate.
     * str* hdrs - string containing extra headers (full format) to be
       added to the BYE requests of the dialog.

Chapter 3. Frequently Asked Questions

   3.1. What happened with “use_tight_match” parameter?
   3.2. Where can I find more about Kamailio?
   3.3. Where can I post a question about this module?
   3.4. How can I report a bug?

   3.1.

   What happened with “use_tight_match” parameter?

   The parameter was removed with version 1.3 as the option of tight
   matching became mandatory and not configurable. Now, the tight matching
   is done all the time (when using DID matching).

   3.2.

   Where can I find more about Kamailio?

   Take a look at https://www.kamailio.org/.

   3.3.

   Where can I post a question about this module?

   First at all check if your question was already answered on one of our
   mailing lists:
     * User Mailing List -
       https://lists.kamailio.org/mailman3/postorius/lists/sr-users.lists.
       kamailio.org/
     * Developer Mailing List -
       https://lists.kamailio.org/mailman3/postorius/lists/sr-dev.lists.ka
       mailio.org/

   E-mails regarding any stable Kamailio release should be sent to
   <sr-users@lists.kamailio.org> and e-mails regarding development
   versions should be sent to <sr-dev@lists.kamailio.org>.

   3.4.

   How can I report a bug?

   Please follow the guidelines provided at:
   https://github.com/kamailio/kamailio/issues.
