[Freeswitch-users] DTMF problems

[Kerem Erciyes]

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>
>>
>
>