diversion_user.sgml

用来作为linux中SIP SERVER,完成VOIP网络电话中服务器的功能

<!-- Module User's Guide -->

<chapter>
    <chapterinfo>
	<revhistory>
	    <revision>
		<revnumber>$Revision: 1.1 $</revnumber>
		<date>$Date: 2004/11/15 13:53:55 $</date>
	    </revision>
	</revhistory>
    </chapterinfo>
    <title>User's Guide</title>
    
    <section>
	<title>Overview</title>
	<para>
	    The module implements the Diversion extensions as per draft-levy-sip-diversion-08.  The
	    diversion extensions are useful in various scenarios involving call
	    forwarding. Typically one needs to communicate the original recipient of the call to the
	    PSTN gateway and this is what the diversion extensions can be used for.
	</para>
    </section>
    <section>
	<title>Dependencies</title>
	<section>
	    <title>&ser; Modules</title>
	    <para>None.</para>
	</section>
	<section>
	    <title>External Libraries or Applications</title>
	    <para>
		The following libraries or applications must be installed before running
		&ser; with this module loaded:
	    	<itemizedlist>
		    <listitem>
			<para>
			    <emphasis>None</emphasis>.
			</para>
		    </listitem>
	    	</itemizedlist>
	    </para>
	</section>
    </section>
    <section>
	<title>Exported Parameters</title>
	<section>
	    <title><varname>suffix</varname> (string)</title>
	    <para>
		The suffix to be appended to the end of the header field. You can use the parameter
		to specify additional parameters to be added to the header field, see the example.
	    </para>
	    <para>
		Default value is <quote></quote> (empty string).
	    </para>
	    <example>
		<title><varname>suffix</varname> usage</title>
		<programlisting format="linespecific">
modparam("diversion", "suffix", ";privacy=full")
</programlisting>
	    </example>
	</section>
    </section>
    <section>
	<title>Exported Functions</title>
	<section>
	    <title><function moreinfo="none">add_diversion(reason)</function></title>
	    <para>
		The function adds a new diversion header field before any other existing Diversion
		header field in the message (the newly added Diversion header field will become the
		topmost Diversion header field). The inbound (without any modifications done by the
		proxy server) Request-URI will be used as the Diversion URI.
	    </para>
	    <para>Meaning of the parameters is as follows:</para>
	    <itemizedlist>
		<listitem>
		    <para><emphasis>reason</emphasis> - The reason string to be added as the reason
			parameter
		    </para>
		</listitem>
	    </itemizedlist>
	    <example>
		<title><function moreinfo="none">add_diversion</function> usage</title>
		<programlisting format="linespecific">
...
add_diversion("user-busy");
...
</programlisting>
	    </example>
	</section>
	    <section>
		<title>Diversion Example</title>
		<para>
		    The following example shows a Diversion header field added to INVITE
		    message. The INVITE message was diverted by the user agent of sip:[e-mail]
		    because the user was talking to someone else and the new destination is 
		    sip:[e-mail].
		</para>
		<programlisting format="linespecific">
INVITE sip:[e-mail] SIP/2.0
From: "5060" &lt;sip:[e-mail]&gt;;tag=ldgheoihege
To: "Jan Janak" &lt;sip:[e-mail]&gt;
Call-ID: adgasdkgjhkjha@1.2.3.4
CSeq: 3 INVITE
Diversion: &lt;sip:[e-mail]&gt;;reason=user-busy
Via: SIP/2.0/UDP 1.2.3.4:5060
Contact: &lt;sip:5060@2.3.4.5&gt;
Content-Length: 0
</programlisting>
	    </section>
    </section>
</chapter>

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