Unable to retrieve DTMF signal for INFO message FIX

[Mark Diab]

Hi,

I've been unable to send DTMF tones to Asterisk resulting in this error every time:

chan_sip.c:21629 handle_request_info: Unable to retrieve DTMF signal for INFO message on call XXX

(latest asterisk 13.1.0)

According to Asterisk docs (I'm not sure if it's standard..) SIP INFO DTMF messages have two alternative formats:

Content-Type: application/dtmf-relay

Signal=5
Duration=160

-------------

Content-Type: application/dtmf

5

-------------

For some reason sipML is sending a mixed format (relay in content type but a single number in the content itself)
Replacing "application/dtmf-relay" with "application/dtmf" in SIPml-api.js magically fixed this problem.

Someone might find this useful tackling the same issue :)

best,

Mark

[favaro....@gmail.com]

Same problem with FreeSwitch, changing the properties "application/dtmf" now i can "hear" the dtmf but the format sent to freeswitch is always the same as dtmf-relay.

[Mark Diab]

Hi,

Try to fiddle with DTMF settings in Freeswitch once you've patched the JS. Mine is set to "auto" in Asterisk - I'm not sure what the freeswitch equivalent is.

Mark

[Mikkel Bach-Mortensen]

Hiya guys, 

I encountered the same problem, it's due to an invalid change to the DTMF Info message in sip-ml5.

See https://groups.google.com/forum/#!topic/doubango/B-SCgOlizhk

Cheers,

X