I am actually getting DTMF over SIP when people call in to a clients system
that is running a2billing. They are using RFC2833.
----- Original Message -----
From: "Remi Quezada" <[EMAIL PROTECTED]>
To: "Asterisk Users Mailing List - Non-Commercial Discussion"
<[email protected]>
Sent: Wednesday, May 09, 2007 6:15 PM
Subject: Re: [asterisk-users] Double DTMF digits
I wonder if your hardware is doing the actual DTMF detecting. What
hardware are you using? I'm using the TE205P and I believe that the DTMF
detection is being done in the software in my case.
Remi
Steve Davies wrote:
On 5/3/07, Ken Leland III <[EMAIL PROTECTED]> wrote:
When dtmfmode is set to inband for SIP, and i originate a call from sip
out to the PSTN, I can hear the DTMF digit twice in the audio stream.
Once very briefly and once for normal duration.
Our Theory: While Asterisk is parsing the DTMF, for a fraction of a
second, while the end user generated DTMF is being detected, the DTMF is
passed inband. Once the DTMF is detected Asterisk silences it and
regenerates it. Sensitive machines like auto attendants pick up both the
brief end user generated tone as well as the full length asterisk
generated tone and ultimately perceive each digit twice.
Is anyone else experiencing this?
I have reproduced this in an environment
* with one asterisk server that is both the feature server and the
media gateway, and is timing off of network T1s
* with two servers, one feature server (timing off of ztdummy) and
one media gateway (timing off of network T1s) using IAX as the inter
asterisk protocol
It is pretty easy to reproduce:
-Dial a PSTN number(like your cell) from a sip phone using inband DTMF,
and configured in asterisk sip.conf with dtmfmode=inband.
-Answer the PSTN end.
-Press and hold a digit on the sip phone. On the PSTN phone you will
hear a very brief, end user generated, tone.
-Let go of the digit on the sip phone. On the PSTN phone you will hear
the asterisk generated tone.
Can anyone else hear the brief initial tone? Any help is greatly
appreciated!
Yes, we have a similar issue, but do not normally use inband DTMF
because SIP phones very cleanly generate rfc2833 RTP packets directly
and remove this issue.
On the other hand, asterisk is not alone dealing with this issue in
SIP. The Linksys ATAs have exactly the same issue.
Strangely, I do not have a problem receiving inband DTMF through
Zaptel, which I believe uses the same DSP code for DTMF detection...
Or does it?
Steve
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