[asterisk-users] DTMF issues...

[Carlos Chavez]

	I am having a big problem with DTMF.  I have a customer using an
Asterisk 1.4.20.1 system with ZTDUMMY as the timing source.  The problem
is that when they dial into a conference bridge or IVR where they have
to enter a code they always get an error.  Either some numbers are
duplicated or missing.

	They use Teliax for calls to the USA and Protel in Mexico.  Both
carriers have the same problem so I think Asterisk could be at fault
here.  I have tried using dtmfmode as auto, inband, info and rfc2833 but
get the same result.  I have tried ulaw, alaw and g729 as the codec for
the calls but have the same problem.

	Could this be a timing issue?  Since there are no zap channels we use
ZTDUMMY for timing.  The server usually runs only about 15 simultaneous
calls so the load is not heavy on the processor.

	What is the best method to debug DTMF issues?  Do I have to sniff the
SIP packets?

-- 
Telecomunicaciones Abiertas de México S.A. de C.V.
Carlos Chávez Prats
Director de Tecnología
+52-55-91169161 ext 2001
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