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@@ -111,469 +111,11 @@
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</para></note>
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</section>
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- <section id="iptrtpproxy.parameters">
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- <title>Parameters</title>
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+ <xi:include href="params.xml"/>
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+ <xi:include href="functions.xml"/>
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- <section id="config">
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- <title><varname>config</varname> (string)</title>
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- <para>
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- References <emphasis>iptrtpproxy.cfg</emphasis>, see <emphasis>iptrtpproxy_helper</emphasis>. Default value
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- is <emphasis>/etc/iptrtpproxy.cfg</emphasis>. If only codec authorization is to be used then
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- <emphasis>/dev/null</emphasis> may be used.
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- </para>
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- </section>
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-
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- <section id="switchboard">
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- <title><varname>switchboard</varname> (string)</title>
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- <para>
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- References <emphasis>xt_RTPPROXY</emphasis> switchboard for usage by ser module.
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- </para>
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- <para>
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- The format is:
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- </para>
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- <programlisting>
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- "name=" value * ( ";" name "=" value )
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-
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- name = "aggregation" | "sip-addr-"
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- </programlisting>
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- <para>
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- The <emphasis>name</emphasis> is the switchboard name as declared in config and will be used by script functions and references switchboard.
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- It's mandatory parameter. The special name <emphasis>*</emphasis> set values for all switchboards.
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- </para>
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- <para>
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- The <emphasis>sip-addr</emphasis> is address used by <function>iptrtpproxy_ser_param(by_sip_ip)</function> to find a switchboard for particular
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- connection. If not explicitly configured then RTP switchboard gate address are used for this feature.
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- </para>
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- <para>
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-The <emphasis>aggregation</emphasis> enables to aggregate more switchboards in cluster and to widden bandwidth.
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-Aggregation will take <emphasis>sip-addr</emphasis> from the first switchboard of its.
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- </para>
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- <example>
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- <title>Declare <varname>switchboard</varname></title>
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- <programlisting>
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- ...
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- modparam("iptrtpproxy", "config", "/etc/iptrtpproxy.cfg");
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- modparam("iptrtpproxy", "switchboard", "name=my1;sip-addr-a=1.2.3.4;sip-addr-b=5.6.7.8");
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- modparam("iptrtpproxy", "switchboard", "name=my2;sip-addr-a=2.3.4.5;sip-addr-b=3.4.5.6;aggregation=my23");
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- modparam("iptrtpproxy", "switchboard", "name=my3;aggregation=my23");
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- modparam("iptrtpproxy", "switchboard", "name=*;aggregation=my123");
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- ...
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- </programlisting>
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- </example>
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- </section>
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-
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- <section id="rpc_heartbeat_timeout">
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- <title><varname>rpc_heartbeat_timeout</varname> (int)</title>
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- <para>
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- Timeout in seconds used for rerequest remote RTP proxy via RPC command after preceeding error.
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- In other words if a RPC server is unresponsive at the moment then next attempt will be forced
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- after this timeout. Default value is <emphasis>30</emphasis>.
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- </para>
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- </section>
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-
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- <section id="hostname">
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- <title><varname>hostname</varname> (string)</title>
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- <para>
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- The hostname used by RPC to identify machine where Ser is running to communicate which RTP proxy
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- via local interface. Default value is taken from system hostname.
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- </para>
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- </section>
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-
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- <section id="declare_codec">
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- <title><varname>declare_codec</varname> (string)</title>
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- <para>
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- There are basic implicit codecs compiled in module, more codecs may be added by this parameter (one codec per modparam).
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- </para>
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- </section>
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-
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- <section id="codec_set">
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- <title><varname>codec_set</varname> (string)</title>
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- <para>
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- Declares new codec set. Codecs are declared for each media type independently.
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- </para>
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- <para>
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- The format is:
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- </para>
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- <programlisting>
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- "name=" value * ( ";" name "=" value )
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-
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- name = "media_type" | "rights" | "codecs" | "max_streams" | ( "rtp" | "rtcp" ) "_" ( "bytes" | "packets" )
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-
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- media_types = "audio" | "video" | "application" | "text" | "message" | "data" | "control" | "?" | "*"
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- </programlisting>
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-
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- <para>
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- The <emphasis>name</emphasis> is the codec set name to be defined.
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- </para>
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- <para>
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- The <emphasis>media_type</emphasis> belongs to type at <emphasis>m=</emphasis> SDP line. Question mark means
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- "unknown media" type and asterisk "all media types".
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- </para>
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- <para>
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- The <emphasis>max_streams</emphasis> defines how many streams (m= lines) is allowed per media type.
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- </para>
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- <para>
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- The <emphasis>rights</emphasis> defines if particular codec is allowed <emphasis>0</emphasis>, disallowed, i.e. will be removed
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- if bit AND operation with <function>remove_codec_mask</function> is non-zero or its presence will be signallized by <function>@iptrtpproxy.auth_rights</function> (any other value).
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- </para>
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- <para>
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- The <emphasis>codecs</emphasis> comma separated list of codecs. Previous <emphasis>media_type&rights</emphasis> will be applied.
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- </para>
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- <para>
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- The <emphasis>rtp/rtcp_bytes/packets</emphasis> limits bandwidth per <emphasis>media_type</emphasis> (0 is unlimited). It will override
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- bandwidth limited by <function>iptrtpproxy_set_param("throttle_*")</function>.
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- </para>
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- <example>
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- <title>Declare <varname>codec_set</varname></title>
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- <programlisting>
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- ...
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- # enable all codecs, default state when codec is declared
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- modparam("iptrtpproxy", "codec_set", "name=cs1;media_type=*;max_streams=9999;rights=0;codecs=*");
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- # allow only 2 audio and 1 video stream
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- modparam("iptrtpproxy", "codec_set", "name=cs2;media_type=*;max_streams=0;media_type=audio;max_streams=2;media_type=video;max_streams=1");
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- # dtto, allow only a few audio and video codecs, GSM codec is allowed but signallized
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- modparam("iptrtpproxy", "codec_set", "name=cs3;media_type=*;max_streams=0;rights=1;codecs=*;media_type=audio;max_streams=2;rights=0;codecs=PCMU,G729,G728,parityfec,telephone-events;rights=2;codecs=GSM;media_type=video;max_streams=1;rights=0;codecs=jpeg,parityfec");
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- # limit max. bandwidth for video¨
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- modparam("iptrtpproxy", "codec_set", "name=cs4;media_type=video;rtp_bytes=10000;rtcp_bytes=1000");
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- ...
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- </programlisting>
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- </example>
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- </section>
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-
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- </section>
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-
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- <section id="iptrtpproxy.functions">
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- <title>Functions</title>
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-
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- <section id="iptrtpproxy_alloc">
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- <title>
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- <function>iptrtpproxy_alloc(gate_a_to_b [, existing_sess_ids])</function>
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- </title>
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- <para>
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- Parses SDP content and allocates for each RTP media stream one RTP proxy session.
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- SDP is updates to reflect allocated sessions. Switchboard/aggregation is set using
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- <function>iptrtpproxy_set_param(by_sip_ip)</function> or <function>iptrtpproxy_set_param("switchboard/aggregation")</function>.
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- </para>
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- <para>
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- Aggregation supports load balancing among more RTP proxies controlled by RPC.
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- The module try to allocate at machines/switchboards in following order (priorities)
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- not yet asked (or being heartbeated) machines, responsive machines, switchboards
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- having percentualy more free slots, non responsive machines.
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- </para>
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- <para>
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- Proxy may hide caller identity provided at <emphasis>o=</emphasis> line using
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- <function>@iptrtpproxy.o_name/addr</function> and <function>iptrtpproxy_set_param(o_name/addr)</function>
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- functions. But the script is responsible for rewritting to original values in
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- a response or a callee initiated re-INVITE. Therefore original value need to be stored
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- in-dialog.
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- </para>
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- <itemizedlist>
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- <listitem>
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- <para>
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- if <emphasis>gate_a_to_b</emphasis> bit 0 is set
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- then SDP regards to gate-a to gate-b direction.
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- </para>
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- </listitem>
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- <listitem>
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- <para>
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- <emphasis>protected_session_ids</emphasis> list of existing sessions
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- enables reusing already allocated sessions in re-INVITE without
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- allocating new sessions for each stream in SDP regardless a IP/port
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- is required. It's mostly undesirable, typically "hold-on" is
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- done via re-INVITE without any change. There is drawback because
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- callee cannot change IP:port in 200OK which is legal case in RFC3264.
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- But because some non-RFC3264 compliant phones dislike proactively
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- changed IP:port at RTP proxy it seems it's less evil.
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- </para>
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- </listitem>
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- <listitem>
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- <para>
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- function returns true is a session was created, identifier is available
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- via select <function>@iptrtpproxy.session_ids</function>.
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- </para>
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- </listitem>
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- </itemizedlist>
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- <example>
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- <title><function>iptrtpproxy_alloc</function> usage</title>
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- <programlisting>
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- ...
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- if (!iptrtpproxy_set_param("aggregation_by_sip_ip_a", "@received.ip")) {
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- if (!iptrtpproxy_set_param("switchboard_by_sip_ip_a", "@received.ip")) {
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- t_reply("500", "RTP proxy error");
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- drop;
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- }
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- }
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- eval_push("x:%@next_hop.src_ip");
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- if (@eval.get[-1] == @received.ip) {
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- if (@iptrtpproxy.aggregation_a) {
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- iptrtpproxy_set_param("aggregation_b", "@iptrtpproxy.aggregation_a");
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- }
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- else {
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- iptrtpproxy_set_param("switchboard_b", "@iptrtpproxy.switchboard_a");
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- }
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- }
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- else {
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- if (!iptrtpproxy_set_param("aggregation_by_sip_ip_b", "@eval.get[-1]")) {
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- if (!iptrtpproxy_set_param("switchboard_by_sip_ip_b", "@eval.get[-1]")) {
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- t_reply("500", "RTP proxy error");
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- drop;
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- }
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- }
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- }
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- eval_remove(-1, 1);
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-
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- if (!iptrtpproxy_alloc("1")) {
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- t_reply("500", "RTP proxy error");
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- drop;
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- }
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- $sess_ids = @iptrtpproxy.session_ids;
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- ...
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- </programlisting>
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- </example>
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- </section>
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-
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- <section id="iptrtpproxy_update">
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- <title>
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- <function>iptrtpproxy_update(gate_a_to_b, session_ids)</function>
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- </title>
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- <para>
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- Parses SDP content and updates sessions provided by <emphasis>session_ids</emphasis> and
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- updates SDP. If succesfull then session_ids may be changed (in case e.g. media
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- stream has port zero particular session is released), the
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- result of <function>@iptrtpproxy.session_ids</function> should be stored for future in-dialog usage.
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- </para>
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- <para>
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- The SDP contect is also affected by <function>iptrtpproxy_set_param(o_name/addr)</function>
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- functions. If a stream is deactivated in SDP then Sessions may be deleted unless
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- mentioned in <emphasis>protected_session_ids</emphasis>.
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- </para>
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- <itemizedlist>
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- <listitem>
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- <para>
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- if <emphasis>gate_a_to_b</emphasis> bit 0 is set
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- then SDP regards to gate-a to gate-b direction.
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- </para>
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- <para>
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- if <emphasis>gate_a_to_b</emphasis> bit 1 is set
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- then SDP is updated only, no RTP session are affected.
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- Should be used when handling retransmission in onreply route,
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- retransmission replies are not eaten be tm module!
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- </para>
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- </listitem>
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- </itemizedlist>
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- <example>
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- <title><function>iptrtpproxy_update</function> usage</title>
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- <programlisting>
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- ...
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- # load $sess_ids from dialog
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- if (iptrtpproxy_update("0", $sess_ids)) {
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- $sess_ids = @iptrtpproxy.session_ids;
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- # save sess_ids in dialog
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- }
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- ...
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- </programlisting>
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- </example>
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- </section>
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-
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- <section id="iptrtpproxy_adjust_timeout">
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- <title>
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- <function>iptrtpproxy_adjust_timeout(gate_a_to_b, session_ids)</function>
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- </title>
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- <para>
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- Adjust timeout for particular gate. It's useful in "200 OK"
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- decrease timeout to learning timeout if INVITE has set (long) <emphasis>ringing timeout</emphasis>.
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- </para>
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- <itemizedlist>
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- <listitem>
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- <para>
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- if <emphasis>gate_a_to_b</emphasis> bit 0 is set
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- then it regards to gate-a to gate-b direction.
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- </para>
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- </listitem>
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- </itemizedlist>
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- <example>
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- <title><function>iptrtpproxy_adjust_timeout</function> usage</title>
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- <programlisting>
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- ...
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- # load $sess_ids from dialog
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- if (status=~"18[0-9]") {
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- iptrtpproxy_set_param("learning_timeout", "60");
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- }
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- else {
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- iptrtpproxy_set_param("learning_timeout", "5");
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- }
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- if (iptrtpproxy_adjust_timeout("0", $sess_ids)) {
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- }
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- ...
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- </programlisting>
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- </example>
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- </section>
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- <section id="iptrtpproxy_delete">
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- <title>
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- <function>iptrtpproxy_delete(session_ids)</function>
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- </title>
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- <para>
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- Delete sessions identified by <emphasis>session_ids</emphasis>. May be used when dialog is being
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- destroyed (BYE) or when INVITE failed in failure route. If <emphasis>protected_session_ids</emphasis>
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- list is provided then this set is excluded from sessions to be deleted.
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- </para>
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- <example>
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- <title><function>iptrtpproxy_delete</function> usage</title>
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- <programlisting>
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- ...
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- # load $sess_ids from dialog
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- iptrtpproxy_delete($sess_ids);
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- ...
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- </programlisting>
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- </example>
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- </section>
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-
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- <section id="iptrtpproxy_authorize_media">
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- <title>
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- <function>iptrtpproxy_authorize_media()</function>
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- </title>
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- <para>
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- Authorizes SDP media according currect <emphasis>codec_set</emphasis>. If bit AND operation
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- between rights in codec set and <function>remove_codec_mask</function> is non zero then
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- such a codec are to be removed. The result may be obtained from
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- <function>@iptrtpproxy.auth_rights</function> which returns max. right which has been applied when
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- processing all codecs of enabled streams.
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- </para>
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- <para>
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- The function MUST NOT be called after <function>iptrtpproxy_alloc/update</function>!
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- But the function may be called several times to authorize using more codec sets.
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- </para>
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- <example>
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- <title><function>iptrtpproxy_authorize_media</function> usage</title>
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- <programlisting>
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- ...
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- if (@iptrtpproxy.active_media_num == "0") break;
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- iptrtpproxy_set_param("codec_set", "cs2");
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- iptrtpproxy_set_param("remove_codec_mask", "1");
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- if (!iptrtpproxy_authorize_media()) {
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- t_reply("415", "Cannot authorize media");
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- drop;
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- }
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- iptrtpproxy_set_param("codec_set", "cs3");
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- if (!iptrtpproxy_authorize_media()) {
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- t_reply("415", "Cannot authorize media");
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- drop;
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- }
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- if (@iptrtpproxy.active_media_num == "0") {
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- t_reply("488", "Not acceptable here");
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- drop;
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- }
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- if (@iptrtpproxy.auth_rights == "2") {
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- append_hf_value("Contact: <sip:1.2.3.4>");
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- t_reply("301", "Redirect to transcoder");
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- drop;
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-
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|
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- }
|
|
|
- ...
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- </programlisting>
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- </example>
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- </section>
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|
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-
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- <section id="iptrtpproxy_set_param">
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- <title>
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- <function>iptrtpproxy_set_param(param, value)</function>
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- </title>
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- <para>
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- Set particular parameter needed mainly by <function>iptrtpproxy_alloc/update/adjust_timeout</function>.
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|
- The paramter value is availble via <function>@iptrtpproxy.<param></function>.
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|
- </para>
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|
|
- <itemizedlist>
|
|
|
- <listitem>
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|
|
- <para>
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|
|
- Supported parameters: <emphasis>expiration_timeout</emphasis>, <emphasis>ttl</emphasis>, <emphasis>learning_timeout</emphasis>,
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|
|
- <emphasis>always_learn</emphasis>,
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|
|
- <emphasis>aggregation_a</emphasis>, <emphasis>aggregation_b</emphasis>,
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|
|
- <emphasis>switchboard_a</emphasis>, <emphasis>switchboard_b</emphasis>,
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|
|
- <emphasis>throttle_mark</emphasis>,
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|
|
- <emphasis>throttle_rtp_max_bytes</emphasis>, <emphasis>throttle_rtp_max_packets</emphasis>,
|
|
|
- <emphasis>throttle_rtcp_max_bytes</emphasis>, <emphasis>throttle_rtcp_max_packets</emphasis>.
|
|
|
- </para>
|
|
|
- </listitem>
|
|
|
- </itemizedlist>
|
|
|
- </section>
|
|
|
-
|
|
|
- <section id="iptrtpproxy_set_param(by_sip_ip)">
|
|
|
- <title>
|
|
|
- <function>iptrtpproxy_set_param("(aggregation/switchboard)_by_sip_ip_(a/b)", sip_ip)</function>
|
|
|
- </title>
|
|
|
- <para>
|
|
|
- Find corresponding aggregation or switchboard and set
|
|
|
- <function>@iptrtpproxy.aggregation_a/b</function> or <function>@iptrtpproxy.switchboard_a/b</function>.
|
|
|
- Switchboards/aggregations are compared against <emphasis>sip-addr</emphasis>,
|
|
|
- it allow separate SIP and RTP traffic and RTP aggregation.
|
|
|
- </para>
|
|
|
- <itemizedlist>
|
|
|
- <listitem>
|
|
|
- <para>
|
|
|
- <emphasis>sip_ip</emphasis> IP to be compared, typically <function>@received.ip</function>
|
|
|
- or <function>@next_hop.src_ip</function>.
|
|
|
- </para>
|
|
|
- </listitem>
|
|
|
- <listitem>
|
|
|
- <para>
|
|
|
- function returns true if switchboard/aggregation was found
|
|
|
- </para>
|
|
|
- </listitem>
|
|
|
- </itemizedlist>
|
|
|
- </section>
|
|
|
-
|
|
|
- <section id="iptrtpproxy_set_param(protected_session_ids)">
|
|
|
- <title>
|
|
|
- <function>iptrtpproxy_set_param("protected_session_ids", sess_ids)</function>
|
|
|
- </title>
|
|
|
- <para>
|
|
|
- Used for reusing sessions in <function>iptrtpproxy_alloc</function>, <function>iptrtpproxy_update</function>
|
|
|
- and <function>iptrtpproxy_delete</function>.
|
|
|
- </para>
|
|
|
- </section>
|
|
|
-
|
|
|
- <section id="iptrtpproxy_set_param(o_name)">
|
|
|
- <title>
|
|
|
- <function>iptrtpproxy_set_param("o_name", value)</function>
|
|
|
- </title>
|
|
|
- <para>
|
|
|
- Username to be rewritten at <emphasis>o=</emphasis> line by <function>iptrtpproxy_alloc/update</function>
|
|
|
- to hide caller identity. If value is blank then username is left unchanged.
|
|
|
- </para>
|
|
|
- </section>
|
|
|
-
|
|
|
- <section id="iptrtpproxy_set_param(o_addr)">
|
|
|
- <title>
|
|
|
- <function>iptrtpproxy_set_param("o_addr", value)</function>
|
|
|
- </title>
|
|
|
- <para>
|
|
|
- Address to be rewritten at <emphasis>o=</emphasis> line by <function>iptrtpproxy_alloc/update</function>
|
|
|
- to hide caller identity. If value is blank then address is left unchanged.
|
|
|
- </para>
|
|
|
- </section>
|
|
|
-
|
|
|
- <section id="iptrtpproxy_set_param(codec_set)">
|
|
|
- <title>
|
|
|
- <function>iptrtpproxy_set_param("codec_set", value)</function>
|
|
|
- </title>
|
|
|
- <para>
|
|
|
- Codec set for <function>iptrtpproxy_authorize_media</function>. Current codec set
|
|
|
- may be obtained by <function>@iptrtpproxy.codec_set</function>.
|
|
|
- </para>
|
|
|
- </section>
|
|
|
-
|
|
|
- <section id="iptrtpproxy_set_param(remove_codec_mask)">
|
|
|
- <title>
|
|
|
- <function>iptrtpproxy_set_param("remove_codec_mask", value)</function>
|
|
|
- </title>
|
|
|
- <para>
|
|
|
- Mask used in <function>iptrtpproxy_authorize_media</function>. Current mask
|
|
|
- may be obtained by <function>@iptrtpproxy.remove_codec_mask</function>.
|
|
|
- </para>
|
|
|
- </section>
|
|
|
- </section>
|
|
|
<section>
|
|
|
<title>Selects</title>
|
|
|
|
Daniel-Constantin Mierla