[Freeswitch-users] start_dtmf when no RFC 2833

[Christopher Rienzo]

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 at 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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