DTMF issue

[akmayuga]

hi guys,

I'm having an issue regarding DTMF, im using gsm gateway(goip4 sim). each time the IVR plays and we key in an extension number(4001) the only number that it recognize is "0".
we already tried all the DTMF mode in the goip. can you please help me...

regards


Ian

 

[Redfone1]

There are several dtmf options you can set in the sip trunk that connects to your external gsm gateway. Here is the complete run down.

dtmfmode=inband

Choices are inband, rfc2833, info or auto

inband: The device that you press the key on will generate the DTMF tones. - If the codec is not ulaw or alaw then the DTMF tones will be distorted by the audio compression and will not be recognised. If the phone is set for RFC2833 and asterisk is set for inband then you may not hear anything.
rfc2833: http://www.ietf.org/rfc/rfc2833.txt
info: See SIP method info and SIP info DTMF or http://www.ietf.org/rfc/rfc2976.txt
auto: Asterisk will use rfc2833 for DTMF relay by default but will switch to inband DTMF tones if the remote side does not indicate support of rfc2833 in SDP. This feature was added on Sep 6, 2005 and is not available in Asterisk 1.0.x.

 

[akmayuga]

Hi Redfone,


thank you so much for that information, I just notice this scenario:

in my gsm gateway(goip4), there is a certain sim card that dosent recognized the DTMF tone, lets say its "sim-A", but when i inserted different sim card with a diferent provider (sim-B,sim-C and Sim-D) it works perfectly and it has the same configuration, do you think it has something to do with our provider on "sim card-A"?

best regards

Ian

 

[Redfone1]

Well you've definitely ruled out the problem being with the hardware. So, yes I would say it's either the SIM card itself, the provider, or it could be the way you have the SIP trunk configured for that particular provider.

good luck.