[asterisk-dev] Inband RTP Ringback tone generator function

[Alok Prasad]

In case of IVR, Asterisk is Sending ringback tone RTP to Caller if
called party is SIP endpoint,
but Its not sending in band RTP Ringback tone when i use some channel
Driver even though i am sending
proper ast_control_queue frame.

I tried some progressinband=yes and prematureaudio settings in
sip.conf with no diffrence .i am using 1.6.2.4 .
Any idea which function actually Sends RTP Ringback tone ?