DTMF generator doesn't seem to produce correct output?

[GoogleCodeExporter]

I can't figure out why this patch isn't working. I can confirm 
mpf_dtmf_generator_put_frame is successfully being called, but the MRCP server 
is not receiving DTMF event frames (as seen in Wireshark).

http://jira.freeswitch.org/secure/attachment/13217/0003-Implement-mod_unimrcp-as
r_feed_dtmf-by-generating-ou.patch
Related issue: http://jira.freeswitch.org/browse/FS-2907

Original issue reported on code.google.com by l...@dashjr.org on 8 Dec 2010 at 2:31

[GoogleCodeExporter]

Hi Luke and others,

briefly looking at the patch, everything seems correct. I can recommend few 
things to try:

* If you can hear audio (speech), try to send the digits in-band, i.e. 
mpf_dtmf_generator_create_ex(stream, MPF_DTMF_GENERATOR_INBAND, 500, 500, pool) 
and listen to the audio transmitted.
* Use mpf_dtmf_generator_sending() for generator's activity detection rather 
than mpf_dtmf_generator_put_frame(), see the documentation in the header.
* AFAIK, out-of-band (RFC2833) digits are modified somehow inside MPF and I am 
not sure how. Anyway, stream with payload type 101 must be properly set up for 
the digits to be sent.

I hope this helps.

Cheers,
- Vali

Original comment by tomas.valenta@speechtech.cz on 15 Dec 2010 at 9:58

[GoogleCodeExporter]

Hi Luke,

I guess the problem is in the setup but not in the patch itself. To make 
out-of-band DTMFs work, "telephone-event" should be properly negotiated through 
SDP offer/answer model. In other words, make sure "telephone-event" is added to 
the codec list of FreeSWITCH's MRCP profile you are using. For example,

   <param name="codecs" value="PCMU PCMA L16/96/8000 telephone-event/101/8000"/>

This is what I could guess for now. If it doesn't help, try to provide logs and 
corresponding network capture as well.

Original comment by achalo...@gmail.com on 3 Jan 2011 at 9:41

• Added labels: Component-FreeSWITCH, Component-MPF, OpSys-All, Priority-Medium, Type-Defect

[GoogleCodeExporter]

This bug is invalid, but I don't know how to close it.

Original comment by l...@dashjr.org on 26 Jan 2011 at 8:43

[GoogleCodeExporter]

Well, if everything works as intended, then let's mark this issues as verified.

Original comment by achalo...@gmail.com on 2 Feb 2011 at 8:23

• Changed state: Verified