You could set the "execute_on_answer" variable on the b-leg dialstring to execute the lua script.  In the lua script, you'd use session:getVariable("switch_r_sdp") and then some pattern matching to figure out if "telephone-event" is in the SDP.  If not, then do session:execute("start_dtmf", "")

Chris

On Tue, Mar 17, 2015 at 3:05 PM, Phillip Jones <pjintheusa@gmail.com> wrote:

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

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