Hi, I have been trying for several days to get DTMF tones working correctly. All keys are recognised by Asterisk (e.g. for retrieving voice messages), but the number ‘3’ is ignored on external PSTN calls. All other keys seem to be OK. I have tried different SIP phones, an analog phone, different dtmf signalling modes, relaxing dtmf tones, banging my head on the desk, and I always get the same result. ‘3’ is ignored.
Does anyone have any ideas (apart from a helmet!)? I have a TDM11B card in my Asterisk server.