Folks,<br><br>We are working on a solution that requires call screening. The user (at terminating carrier) will be explicitly requested to "Press 1" to accept the call (no digit pressed in 10 seconds= call rejected). The calls may be terminated by international carriers. In the past, we have had issues with DTMF detection using Asterisk/US-Carriers, specially for calls terminating internationally? Could it be Asterisk/Config issues or could it be issues with our carrier routes?<br>
<br>We had a bunch of SIP trunks through reputed carriers still there was no luck claiming full DTMF capabilities? We tried all 3 methods of DTMF detection and some of them worked most of the time (~75%) and we had users complaining 25% of the time suggesting call rejection despite their intention (pressed 1 many times) to accept the call. Since the config worked most of the time, I suspect it has anything to do Asterisk config. Asterisk itself could be trouble and that's a different story. By the way, we were using (and we are planning to use) SIP trunks so no issues on TDM/Timing etc..<br>
<br>Any pointers/help/comments would be appreciated. Specially, if you suspect its likely to be a carrier issue, then recommendation for carriers (international termination) would go a long way for us...<br><br>Thanks a lot.<br>
<br>Ritesh<br><br><br>