[asterisk-users] Inband SIP DTMF

[Norman Franke]

I've been searching to a solution to this for a while and can't  
figure it out, perhaps someone has done something similar.

I have a Cisco AS5400 sending SIP traffic via PCMU / ulaw directly to  
my Asterisk (1.4.19-rc2) box. Jitter and latency are incredibly low  
on my lightly loaded switched gigabit ethernet network. One Asterisk  
uses Zaptel and a Digium card, and DTMF recognition works great.  
However, the same software can't seem to recognize DTMF over SIP inband.

I've tried enabling DTMF debugging, which never prints anything even  
with "core set debug 10" and "core set verbose 10". Any thoughts on  
how to get this working? My dialplan snippet is:

exten => 6220,1,Answer()
exten => 6220,n,Playback(high)
exten => 6220,n,Read(TEST||7)
exten => 6220,n,SayDigits(${TEST})

It always says:

     -- User entered nothing.

If I send rfc2833 messages from a soft phone, it always works, of  
course. I've tried "relaxdtmf=yes" in sip.conf, as well. I added  
"dtmfmode=inband" to the SIP peer for the Cisco. Nothing. Tones are  
generated by phones connected to our PBX that we don't have a problem  
with otherwise or even from a cell phone.

Norman Franke
Answering Service for Directors, Inc.
www.myasd.com

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