[Freeswitch-users] DTMF problems

[Boris Kovalenko]

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:
>
>> Hello!
>>
>>       Kerem, are You talking about input gain parameter? AFAIK it is 0db
>> by default. Would You recomend to set it lower?
>> ISDN 1/0:D - 1/0:D
>>    Type of VoicePort is ISDN
>>    Operation State is DORMANT
>>    Administrative State is UP
>>    No Interface Down Failure
>>    Description is Link to ATSE-41
>>    Noise Regeneration is disabled
>>    Non Linear Processing is disabled
>>    Non Linear Mute is disabled
>>    Non Linear Threshold is -21 dB
>>    Music On Hold Threshold is Set to -38 dBm
>>    In Gain is Set to 0 dB
>>    Out Attenuation is Set to 0 dB
>>    Echo Cancellation is enabled
>>    Echo Cancellation NLP mute is disabled
>>    Echo Cancellation NLP threshold is -21 dB
>>    Echo Cancel Coverage is set to 32 ms
>>    Echo Cancel worst case ERL is set to 6 dB
>>    Playout-delay Mode is set to adaptive
>>    Playout-delay Nominal is set to 60 ms
>>    Playout-delay Maximum is set to 250 ms
>>    Playout-delay Minimum mode is set to default, value 40 ms
>>    Playout-delay Fax is set to 300 ms
>>    Connection Mode is normal
>>    Connection Number is not set
>>    Initial Time Out is set to 10 s
>>    Interdigit Time Out is set to 10 s
>>    Call Disconnect Time Out is set to 60 s
>>    Ringing Time Out is set to 180 s
>>    Wait Release Time Out is set to 30 s
>>    Spe country is russia
>>    Region Tone is set for RU
>>    Station name None, Station number None
>>    Translation profile (Incoming):
>>    Translation profile (Outgoing):
>>
>>> Hi Boris,
>>>
>>> I have had same kind of problems with PRI circuits between Channel Banks
>>> and VoIP Servers due to static on the POTS line and/or too high gain
>>> settings on the PRI cicuit. Try playing with the gain settings on the
>>> Cisco 5350, maybe that can help.
>>>
>>> Regards,
>>> Kerem
>>>
>>>
>>>
>>> On Tue, 24 May 2011 15:11:08 +0300, Boris Kovalenko<boris at tagnet.ru>
>>> wrote:
>>>
> <snip>
>>
>
>
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-- 
Regards,
Boris