Hi All,

The following dial plan detects RFC 2833 and if it is not present, runs the "start_dtmf" application.

<condition field="${switch_r_sdp}" expression="a=rtpmap:(\d+)\stelephone-event/8000" break="never"> 

<action application="set" data="rtp_payload_number=$1"/> 

<anti-action application="start_dtmf"/> 

</condition>

I need to do this on the outbound leg - using Lua. Can anyone point me to some code example that would achieve this or get me started?

Any help appreciated.

Thanks

Phil