[Freeswitch-users] DTMF problems

[Kerem Erciyes]

No problem Boris. I never had much success with in-band DTMF but as M.  
Collins suggested in a separate thread there are some cases where you  
really need in-band detection (i.e. calls via GSM networks always send  
in-band DTMF), I suggest you try recording the calls and try to make sense  
of how much of the DTMF tone is being received, if there is stuttering due  
to echo cancellation or static on the line, etc...

On Tue, 24 May 2011 16:57:15 +0300, Boris Kovalenko <boris at tagnet.ru>  
wrote:

> Hello!
>
>      Thank You Kerem, I'll try. The main problem is that there is a
> little percent of wrong DTMF and a very nervous customer.
> Also what if not to use dtmf-relay on Cisco at all? What kind of
> problems may I have? I use G711alaw inside a network. Some transit calls
> (ie Internet -> PSTN) may use G729.
>
>> Yes Boris, try setting it lower incrementally and see if it helps. There
>> might be problems related to gain + echo on the line that confuses DTMF
>> detection, so check if the line has echo as well. Also sometimes I have
>> seen that the remote calling party has a POTS line with too much static  
>> it
>> can confuse DTMF detection. On other VoIP systems we solved this problem
>> by spying on the channel e.g.
>> http://wiki.freeswitch.org/wiki/Misc._Dialplan_Tools_eavesdrop can be
>> helpful in debugging the situation.
>>
>> On Tue, 24 May 2011 16:10:03 +0300, Boris Kovalenko<boris at tagnet.ru>
>> wrote:
>>
<snip>
>> <snip>
<snip>
>>
>>
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>
>