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

[Michael D Schelin]

Grandstream has the same problem. Very common. A simple DTMF debouncer 
curcuit will fix it.

Doug Meredith wrote:

>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
>  
>

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