[Asterisk-Users] Re: Beeps during Sip to Sip phone calls

[Doug Meredith]

Eric Wieling <eric at fnords.org> wrote:

>Daryll Strauss wrote:
>
>> Yep, I've seen it and from reading http://www.voxilla.com it's a
>> pretty common problem.
>> 
>> If you turn on debugging what you'll see is that the Sipura has
>> mistakenly detected a DTMF code in the audio stream and is relaying it
>> by repeating the signal (very loudly I might add)
>> 
>> So this appears to be a bug in the most current firmware. I've
>> reported it to Sipura including the debug output. Maybe more people
>> should do the same.
>
>You'd think that switching to RFC2833 DTMF would fix that.

That is actually the problem.  It thinks it hears DTMF so it sends an
out-of band signal.  The other end receives this and produces the
audible tone.

Switching to in-band fixes it.  Well, works around it. :)

Doug
-- 
Doug Meredith (doug.meredith at systemguard.com)
SystemGuard - Oracle remote support
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