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msrp_ua docs: add devel docs and an external usage summary section
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<!-- Module Developer's Guide --> | ||
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<chapter> | ||
<title>&develguide;</title> | ||
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<section id="devel_overview" xreflabel="Overview"> | ||
<title>Overview</title> | ||
<para> | ||
In order to answer a SIP session carying MSRP the <xref linkend="func_init_uas"/> | ||
function should be used. Conversely for starting a MSRP call as a UAC, one | ||
can use the <xref linkend="func_init_uac"/> function. | ||
</para> | ||
<para> | ||
After initializing the session with either of the above functions, the SIP call | ||
will be further handled by the module and notifications regarding significant SIP | ||
level events and received MSRP requests and responses will be delivered via | ||
registering callback functions. | ||
</para> | ||
<para> | ||
MSRP SEND requests can be sent with the <xref linkend="func_send_message"/> function | ||
after the sessions is established, which will be signaled by the | ||
<emphasis>msrp_ua_notify_cb_f</emphasis> callback with the | ||
<emphasis>MSRP_UA_SESS_ESTABLISHED</emphasis> event. | ||
</para> | ||
<para> | ||
Received MSRP requests, transaction responses and local send timeouts will be | ||
signaled via the <emphasis>msrp_ua_req_cb_f</emphasis> and | ||
<emphasis>msrp_ua_rpl_cb_f</emphasis> callbacks. | ||
</para> | ||
</section> | ||
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<section> | ||
<title>Available Functions</title> | ||
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<section id="func_init_uas" xreflabel="init_uas()"> | ||
<title> | ||
<function moreinfo="none">init_uas(msg, accept_types, hdl)</function> | ||
</title> | ||
<para> | ||
This function will intialize a MSRP UA session based on a received SIP | ||
INVITE. | ||
</para> | ||
<para>Meaning of the parameters is as follows:</para> | ||
<itemizedlist> | ||
<listitem> | ||
<para><emphasis>struct sip_msg *msg</emphasis> - the SIP message | ||
</para> | ||
</listitem> | ||
<listitem> | ||
<para><emphasis>str *accept_types</emphasis> - the value of the | ||
"accept-types" attribute to include in the SDP offer. | ||
</para> | ||
</listitem> | ||
<listitem> | ||
<para><emphasis>struct msrp_ua_handler *hdl</emphasis> - handler | ||
structure used to register the callbacks for SIP level and MSRP | ||
level notifications. | ||
</para> | ||
</listitem> | ||
</itemizedlist> | ||
<example> | ||
<title><function>struct msrp_ua_handler</function> structure</title> | ||
<programlisting format="linespecific"> | ||
struct msrp_ua_handler { | ||
/* name of this registration */ | ||
str *name; | ||
/* parameter to be passed to msrp_req_cb and msrp_rpl_cb callbacks */ | ||
void *param; | ||
/* callback for SIP level notifications */ | ||
msrp_ua_notify_cb_f notify_cb; | ||
/* callback for receving MSRP requests */ | ||
msrp_ua_req_cb_f msrp_req_cb; | ||
/* callback for receving MSRP responses */ | ||
msrp_ua_rpl_cb_f msrp_rpl_cb; | ||
}; | ||
</programlisting> | ||
</example> | ||
<example> | ||
<title><function>msrp_ua_notify_cb_f</function> prototype</title> | ||
<programlisting format="linespecific"> | ||
typedef int (*msrp_ua_notify_cb_f)(struct msrp_ua_notify_params *params, | ||
void *hdl_param); | ||
</programlisting> | ||
</example> | ||
<example> | ||
<title><function>struct msrp_ua_notify_params</function> structure</title> | ||
<programlisting format="linespecific"> | ||
struct msrp_ua_notify_params { | ||
/* event type */ | ||
enum msrp_ua_event_type event; | ||
/* SIP message */ | ||
struct sip_msg *msg; | ||
/* SDP "accept-types" attribute in case of MSRP_UA_SESS_ESTABLISHED event */ | ||
str *accept_types; | ||
/* MSRP UA session ID */ | ||
str *session_id; | ||
}; | ||
</programlisting> | ||
</example> | ||
<example> | ||
<title><function>enum msrp_ua_event_type</function></title> | ||
<programlisting format="linespecific"> | ||
enum msrp_ua_event_type { | ||
/* session established (ACK sent/received) */ | ||
MSRP_UA_SESS_ESTABLISHED = 1, | ||
/* failed to establish session (negative reply/timeout etc.) */ | ||
MSRP_UA_SESS_FAILED, | ||
/* BYE received/sent(in case of session timeout) */ | ||
MSRP_UA_SESS_TERMINATED | ||
}; | ||
</programlisting> | ||
</example> | ||
<example> | ||
<title><function>msrp_ua_req_cb_f</function> prototype</title> | ||
<programlisting format="linespecific"> | ||
typedef int (*msrp_ua_req_cb_f)(struct msrp_msg *req, void *hdl_param); | ||
</programlisting> | ||
</example> | ||
<example> | ||
<title><function>msrp_ua_rpl_cb_f</function> prototype</title> | ||
<programlisting format="linespecific"> | ||
/* an MSRP transaction timeout will be signaled by calling this callback | ||
* with a NULL rpl parameter */ | ||
typedef int (*msrp_ua_rpl_cb_f)(struct msrp_msg *rpl, void *hdl_param); | ||
</programlisting> | ||
</example> | ||
</section> | ||
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<section id="func_init_uac" xreflabel="init_uac()"> | ||
<title> | ||
<function moreinfo="none">init_uac(accept_types, from_uri, to_uri, ruri, hdl)</function> | ||
</title> | ||
<para> | ||
This function will intialize a MSRP UA session by sending a SIP INVITE to | ||
a destination. | ||
</para> | ||
<para>Meaning of the parameters is as follows:</para> | ||
<itemizedlist> | ||
<listitem> | ||
<para><emphasis>str *accept_types</emphasis> - the value of the | ||
"accept-types" attribute to include in the SDP offer. | ||
</para> | ||
</listitem> | ||
<listitem> | ||
<para><emphasis>str *from_uri</emphasis> - URI to use in the From | ||
header of the INVITE. | ||
</para> | ||
</listitem> | ||
<listitem> | ||
<para><emphasis>str *to_uri</emphasis> - URI to use in the To | ||
header of the INVITE. | ||
</para> | ||
</listitem> | ||
<listitem> | ||
<para><emphasis>str *ruri</emphasis> - Request URI to use in the for | ||
the INVITE. | ||
</para> | ||
</listitem> | ||
<listitem> | ||
<para><emphasis>struct msrp_ua_handler *hdl</emphasis> - handler | ||
structure used to register the callbacks for SIP level and MSRP | ||
level notifications. | ||
</para> | ||
</listitem> | ||
</itemizedlist> | ||
</section> | ||
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<section id="func_end_session" xreflabel="end_session()"> | ||
<title> | ||
<function moreinfo="none">end_session(session_id)</function> | ||
</title> | ||
<para> | ||
This function terminates an MSRP session. | ||
</para> | ||
<para>Meaning of the parameters is as follows:</para> | ||
<itemizedlist> | ||
<listitem> | ||
<para><emphasis>str *session_id</emphasis> - MSRP UA session ID. | ||
</para> | ||
</listitem> | ||
</itemizedlist> | ||
</section> | ||
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<section id="func_send_message" xreflabel="send_message()"> | ||
<title> | ||
<function moreinfo="none">send_message(session_id, mime, body, failure_report, success_report)</function> | ||
</title> | ||
<para> | ||
This functions sends an MSRP SEND request to the peer. | ||
</para> | ||
<para>Meaning of the parameters is as follows:</para> | ||
<itemizedlist> | ||
<listitem> | ||
<para><emphasis>str *session_id</emphasis> - MSRP UA session ID. | ||
</para> | ||
</listitem> | ||
<listitem> | ||
<para><emphasis>str *mime</emphasis> - MIME content | ||
type of this message. If NULL, an empty message will be sent. | ||
</para> | ||
</listitem> | ||
<listitem> | ||
<para><emphasis>str *body</emphasis> - actual message | ||
body. If NULL, an empty message will be sent. | ||
</para> | ||
</listitem> | ||
<listitem> | ||
<para><emphasis>enum msrp_failure_report_type failure_report</emphasis> - | ||
MSRP Failure Report type - yes, no or partial. | ||
</para> | ||
</listitem> | ||
<listitem> | ||
<para><emphasis>int success_report</emphasis> - indication whether to | ||
request an MSRP Failure Report or not. | ||
</para> | ||
</listitem> | ||
</itemizedlist> | ||
<example> | ||
<title><function>enum msrp_failure_report_type</function></title> | ||
<programlisting format="linespecific"> | ||
enum msrp_failure_report_type { | ||
MSRP_FAILURE_REPORT_YES, | ||
MSRP_FAILURE_REPORT_PARTIAL, | ||
MSRP_FAILURE_REPORT_NO | ||
}; | ||
</programlisting> | ||
</example> | ||
</section> | ||
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</section> | ||
</chapter> |