search for: dsp_digitmode_noquelch

...s is the way that asterisk works. It is going to quelch all DTMF that goes out via a SIP gateway via asterisk. I spent a long time working this through and it has to do with the way that asterisk deals with DTMF and the DSP.c module that sits inband to the RTP/audio stream. There is a flag called DSP_DIGITMODE_NOQUELCH that is broken that might allow the inband DTMF after answer to work on inband but its broke. If you do not use asterisk as your gate/ to/from the PSTN you are going to have a issue with DTMF after connect. There are a couple of kludges that can get it to work part of the time. But from my experi...