I am trying to enable IAX2 support for freeswitch. I successfully compiled and install PTLIB and OPAL. Also recompiled freeswitch with mod_opal successfully.
Below is opal.conf.
<configuration name="opal.conf" description="Opal Endpoints">
<settings>
<param name="trace-level" value="25"/>
<param name="context" value="default"/>
<param name="dialplan" value="XML"/>
<param name="dtmf-type" value="signal"/> <!-- string, signal, rfc2833, in-band -->
<param name="jitter-size" value="40,100"/> <!-- Jitter buffer min/max size, milliseconds -->
<param name="codec-prefs" value="PCMU,PCMA"/> <!-- list, and preferecnce order, of codecs -->
<!-- <param name="disable-transcoding" value="true"/> --> <!-- do not transcode, use source channel codec only -->
<param name="gk-address" value="*"/> <!-- empty to disable, "*" to search LAN -->
<param name="gk-identifer" value=""/> <!-- optional name of gk -->
<param name="gk-interface" value="<My Public IP>"/> <!-- optional listener interface name -->
</settings>
<listeners>
<listener name="default">
<param name="h323-ip" value="<My Public IP>"/>
<param name="h323-port" value="1720"/>
</listener>
</listeners>
</configuration>