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DTMF issues and delay

Hello! We have problems with DTMF tones on Snom D715, D765 and D725 phones on a 3CX PBX. At irregular intervals, the Snom phones stop sending DTMF tones. After a restart, the problem is gone for a short time. But comes back at irregular intervals. With firmware 8.9.3.66 the issue was “huge”. It seems to be fixed in firmware 8.9.3.87. Now, a new firmware is out: 8.9.3.88 and we have similar issues again. DTMF works but it is delayed. If I press a button, the DTMF signal is delayed for about 10 to 15 seconds. If I press DTMF keys several times in succession, you will not hear anything at first (no sound will be sent). Then suddenly all sounds are sent at once. Sometimes it works still fine. Sometimes with delay. We also unse the Snom DECT M700 system. DTMF here works perfect.
Best Answer
Hello!
We changed the setting

Identity X >> SIP >> DTMF via SIP INFO : sip info only

It looks the issue is solved.
It seems to be more a 3CX than a snom issue.

7 CommentsSorted by Oldest First

Hi... we have the same issue :-(

Are you using 3CX?

Yes 3CX. 

Hello,


After how much time does the issue occur after reboot?


We have an existing issue (SCPP-8179) and we're working on it. 


In the meanwhile can you try to change the following setting: http://wiki.snom.com/Settings/user_dtmf_info to value "sip_info_only" or "on" ?


Thanks

Catalina


 We have the same issue with D375 and 3cx. 8.9.3.88. But i do not find the DTMF setting.


regards


Michael

Hi Michael,


The setting is here: Identity X -> SIP -> DTMF via SIP INFO  


Regards

Catalina

Answer
Hello!
We changed the setting

Identity X >> SIP >> DTMF via SIP INFO : sip info only

It looks the issue is solved.
It seems to be more a 3CX than a snom issue.

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