Hello! A few days ago I posted this issue: https://www.3cx.com/community/threads/dtmf-issues-with-snom.55196/#post-228225 With firmware 220.127.116.11 for our Snom phones the DTMF issue was solved. Now, a new firmware is out: 18.104.22.168 and we have similar issues again. (Snom D715, D725, D765) 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. Please help!