kamailio/modules/alias_db

ALIAS_DB Module

Daniel-Constantin Mierla



Elena-Ramona Modroiu



Edited by

Daniel-Constantin Mierla



Copyright � 2005 Voice Sistem SRL

Copyright � 2008 asipto.com
__________________________________________________________________

Table of Contents

1. Admin Guide

1. Overview
2. Dependencies

2.1. Kamailio Modules
2.2. External Libraries or Applications

3. Parameters

3.1. db_url (str)
3.2. user_column (str)
3.3. domain_column (str)
3.4. alias_user_column (str)
3.5. alias_domain_column (str)
3.6. use_domain (int)
3.7. domain_prefix (str)
3.8. append_branches (int)

4. Functions

4.1. alias_db_lookup(table_name)

List of Examples

1.1. Set db_url parameter
1.2. Set user_column parameter
1.3. Set domain_column parameter
1.4. Set alias_user_column parameter
1.5. Set alias_domain_column parameter
1.6. Set use_domain parameter
1.7. Set domain_prefix parameter
1.8. Set append_branches parameter
1.9. alias_db_lookup() usage

Chapter 1. Admin Guide

Table of Contents

1. Overview
2. Dependencies

2.1. Kamailio Modules
2.2. External Libraries or Applications

3. Parameters

3.1. db_url (str)
3.2. user_column (str)
3.3. domain_column (str)
3.4. alias_user_column (str)
3.5. alias_domain_column (str)
3.6. use_domain (int)
3.7. domain_prefix (str)
3.8. append_branches (int)

4. Functions

4.1. alias_db_lookup(table_name)

1. Overview

The ALIAS_DB module can be used as an alternative for user aliases via
usrloc. The main feature is that it does not store all addiacent data
as for user location and always uses the database for search (no memory
caching). A common use case is to provide additional user aliases, i.e.
to supplement the registration in the location database. Users are this
way on a proxy reachable with several request URIs.

As the module use no memory caching the lookup is a bit slower but the
data provisioning is easier. With very fast databases like MySQL the
speed penalty can be lowered. Also, the search can be performed on
different tables in the same script.

2. Dependencies

2.1. Kamailio Modules
2.2. External Libraries or Applications

2.1. Kamailio Modules

The following modules must be loaded before this module:
* database module (mysql, dbtext, ...).

2.2. External Libraries or Applications

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

3. Parameters

3.1. db_url (str)
3.2. user_column (str)
3.3. domain_column (str)
3.4. alias_user_column (str)
3.5. alias_domain_column (str)
3.6. use_domain (int)
3.7. domain_prefix (str)
3.8. append_branches (int)

3.1. db_url (str)

Database URL.

Default value is "mysql://openserro:openserro@localhost/openser".

Example 1.1. Set db_url parameter
...
modparam("alias_db", "db_url", "dbdriver://username:password@dbhost/dbname")
...

3.2. user_column (str)

Name of the column storing username.

Default value is "username".

Example 1.2. Set user_column parameter
...
modparam("alias_db", "user_column", "susername")
...

3.3. domain_column (str)

Name of the column storing user's domain.

Default value is "domain".

Example 1.3. Set domain_column parameter
...
modparam("alias_db", "domain_column", "sdomain")
...

3.4. alias_user_column (str)

Name of the column storing alias username.

Default value is "alias_username".

Example 1.4. Set alias_user_column parameter
...
modparam("alias_db", "alias_user_column", "auser")
...

3.5. alias_domain_column (str)

Name of the column storing alias domain.

Default value is "alias_domain".

Example 1.5. Set alias_domain_column parameter
...
modparam("alias_db", "alias_domain_column", "adomain")
...

3.6. use_domain (int)

Specifies whether to use or not the domain from R-URI when searching
for alias. If set to 0, the domain from R-URI is not used, if set to 1
the domain from R-URI is used.

Default value is "0".

Example 1.6. Set use_domain parameter
...
modparam("alias_db", "use_domain", 1)
...

3.7. domain_prefix (str)

Specifies the prefix to be stripped from the domain in R-URI before
doing the search.

Default value is "NULL".

Example 1.7. Set domain_prefix parameter
...
modparam("alias_db", "domain_prefix", "sip.")
...

3.8. append_branches (int)

If the alias resolves to many SIP IDs, the first is replacing the
R-URI, the rest are added as branches.

Default value is "0" (0 - don't add branches; 1 - add branches).

Example 1.8. Set append_branches parameter
...
modparam("alias_db", "append_branches", 1)
...

4. Functions

4.1. alias_db_lookup(table_name)

4.1. alias_db_lookup(table_name)

The function takes the R-URI and search to see whether it is an alias
or not. If it is an alias for a local user, the R-URI is replaced with
user's SIP uri.

The function returns TRUE if R-URI is alias and it was replaced by
user's SIP uri.

Meaning of the parameters is as follows:
* table_name - the name of the table where to search for alias. It
can include pseudo-variables.

This function can be used from REQUEST_ROUTE, FAILURE_ROUTE.

Example 1.9. alias_db_lookup() usage
...
alias_db_lookup("dbaliases");
alias_db_lookup("dba_$(rU{s.substr,0,1})");
...