DTMF being passed both ways

Asterisk Asterisk Support
1

When using Asterisk to dial into a SIP provider, leaving dtmfmode as rfc2833 for that SIP ‘friend’ enables DTMF to be recognized by the SIP provider. Using a Dial(SIP/XX|10|t) should enable transfers on the SIP provider’s side, but Asterisk does not recognize the DTMF thats required to initiate transfers when using dtmfmode=rfc2833.

When I switch to inband in sip.conf, Asterisk now recognizes the DTMF and initiates the transfer but the DTMF no longer get passed to the SIP provider.

I have tried INFo and AUTO dtmfmode, and have not had luck getting DTMFs to be recognized both ways.

Is there a way to pass DTMFs through Asterisk from the callee and called side?

2

this is an issue with your SIP provider. They are not encoding the DTMF being passed inward, so neither setting gets both sides of it.

I think your best bet might be to separate the sip.conf entry into an incoming and outgoing section.

IE

register => user:pass@provider_in

[provider]
blah blah blah same stuff you had before
dtmfmode=rfc2833

[provider_in]
copy of above
dtmfmode=inband