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we have a problem, which is simmilar to the following 

● SAP-609 FIX: Snom 710 / D710: Loss of DTMF or Call Waiting tone after ~280 calls received
● SAP-1573 FIX: Snom 710 / D710: DTMF (in-band) stopped working after ~400 calls and needs a reboot to recover it

But we don't use 710 / D710 - we have D375/D345 phones. And all of them struggle with DTMF problems as described. The Problem started with and the did not fix the Problem.

When will the fix be available for the D3X5 phones?

Thanks in advance,

Rafael Pappert.

Best Answer

This issue has been converted to a ticket.


Snom Support


There is a firmware fix for this. Which phones do you need firmware for?


Sean Collins

Snom Support

1 person likes this

Hi @all,

one last remaining issue with DTMF (about 24 days runtime minimum) is solved in current Release Candidate

See release notes:
SAP-3489: Sometimes the DTMF-inband-support did stop after approximately 24 days, SIP INFO user_dtmf_info was not affected #Asterisk #3CX [SCPP-8745]

Current plan for a release is end of this month (earliest: June 27. )

Thanks for your patience and cooperation.

Greetings from Berlin,


Currently using, the beta release which was supposed to fix the problem and the bug has hit again. Phone uptime is 114d, I don't know for how long it was not working, just noticed today.

Hi Sean, is there already an solution for this problem? We actually trying the variable <user_dtmf_info idx="1" perm="">on</user_dtmf_info>, don't know if it will fix it but a fix via firmware would be great.
Thank, David


We just experienced the same DTMF issue today on two Snom D785 phones running Firmware Version

Our provider is using an Asterisk server I suppose, DTMF via SIP INFO is set to off.

A reboot temporarily fixed the issue.

Hi Lennart,


Many customers reported to no longer have this issue with version

Would you be able to set up a syslog server and provide the logs from the restart until the issue starts occurring? For instructions see . If yes, your logs would be very helpful to figure out why the issue still occurs in your case.

If you can get the logs, as soon as the issue starts occurring again please also get the media.htm page (http://IP/media.htm -> reload once and then copy the output).

Please don't post the logs in this forum for data protection reasons. Instead, please open a ticket and provide us the logs, or let me know if I should open a ticket for you.



I also have this problem on various Snom D765 phones with FW

Just installed FW on one of the phones. Wow, quite different... I'm a bit torn if I should go directly to FW 10 for all users to get rid of the annoying DTMF problem or try the beta FW


we have tested the firmware snomD765-SIP but the dtmf problem still exists. After a few weeks the dtmf tone is lost. After a reboot it works for some time.

Are there any new information about that?

best regards

Hi Sean,
great! We need it for the D315, D345 and D375.
Thanks, David


Hi Sean,

we have the same issues with the D765. Is a patched firmware available for this model?

best regards

Hi Catalina,

We experience the same DTMF issues with FusionPBX (based on Freeswitch).  Is there a fix for the SNOM 760 as well?  I've tried the following link but it doesn't work:


Hi Romeo,

Unfortunately, we don't have a fix version for the 760 because this product is EOL (see ). I am sorry for the bad news. 

Maybe you can try the workaround (change the setting Identity X >> SIP >> DTMF via SIP INFO : sip info only), or use an older version. We have had one customer who reported that the DTMF issue did not happen with version snom760-, maybe you can try that?

File Name: snom760-
Size: 27 MB
SHA256: 8be243139580faab6c35af0d1a18a6b15c57049ef69e6458cbf155eff30e2282
Download URL:




3CX has just released version 15.5 Update 6. This version contains the patch for Snom phones, which fixes the issues with DTMF


Sean Collins 

Snom Support

Hi Kai-Oliver,

Here is the beta-patch with the DTMF fix for D765:

File Name: snomD765-

Size: 29 MB

SHA256: 06d69bf8a14915003044c581695ed860e84d2b2f744329e6c1f64ba9379a1560

Download URL:

Please note that this is a beta version. We don't recommend test versions to be used in a production environment

You can receive automatic notifications about new official firmware releases following the instructions described here.



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