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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

Hi Sean, we don't use a 3CX pbx. Is there a way to download the firmware somewhere else?

Hi Catalina,

Thanks for your prompt reply.  That's a pity, our 760s are less than 3 years old but I guess nothing can be done about that.  IMO it's quite a critical bug rendering the phone practically unusable every 200 - 300 calls.  If I change to DTMF via SIP to SIP INFO only, DTMF stops working entirely but that might be solved with a configuration change on the PBX itself.

Are there any security implications if we downgrade to snom760-

Hi Catalina, we will test it.

thank you

Hi Romeo,

I know, I wish I could help you more with this. Alternatively you might consider replacing the phones, your reseller/provider should be able to make you a good offer considering  that you already have Snom products.

Just note that version was not an official release and is not recommended to be used in production. I am not sure about the security considerations, but if you want to be safe maybe try one of the older official releases:




This forum post pertains to an issue with DTMF and 3CX. What are the particulars of the issue you are experiencing?

Hi Kai-Oliver,

Most customers have reported version to have fixed the issue. Would you be able to set up persistent logging (with a syslog server or on an USB stick) with log-level set to DEBUG2, lasting from the reboot until the issue occurs? 

If yes: your logs would be very helpful to figure out why the issue still occurs in your case. Please open a ticket to provide the logs, or let me know if I should open a ticket for you.



We experience these problems with an elastix pbx, the predecessor of the 3CX, same issues.

This issue has been converted to a ticket.


Snom Support

Hi Catalina,

we were not able to reproduce the issue so far.

I will get back to you, if that happens.



Hi Catalina,

we will try to get the logs. It could be take some time. We will check if we have the possibility for a syslog server.

If we have finished i will contact you again.

Thank you

Hi David,

I have sent you the links to the test patch firmware per email.



Hi Kai-Oliver,

as you reported this for D765, it is likely worth monitoring / pilot-testing a few D765 with our Release 10:

Between 8.9.3.x and 10.x are countless major changes, so that its possible a will never show the DTMF outage you reported.

But first, please make sure you review all details (Release Notes & hints) , plus check out the NewUI and compare to the 8.9.3.x UI your users are familar with.

Thanks and greetings from Berlin,


It just happened to us again on a SNOM 715 with the latest firmware.  We're using a Freeswitch based PBX.  It is quite hard to reproduce, since it happens very randomly.

Kind regards,


Hi Catalina,

thank you for the links, we plan the rollout for tonight.

Best wishes,


Hi Jan,

we have some test phones so we will test the new firmware. Thank you for the notice.


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