DTMF Tones & 3cx

[myfastback.com]

I have been having an issue sometimes where our phone system will not send out the correct DTMF tones. For example, if I call into a company and have to dial an extension, or call into a conf call and have to hit the conf call ID, it will skip/miss digits that I enter. This seems to be random, but a few companies we work with a lot have the same issue, so it is very annoying.

I am running T48 and T38 phones on 3cx 12.5. All phone have the same issue. I have attached snap shots of the transmission from wire shark. It appears that the DTMF signal is being sent 3 times for each 1 time I hit the button. When I call my cell phone and hit a button the DTMF tone come over all garbled and stutters.

T48 Firmware 35.73.0.40
T38 Firmware 38.70.2.221

Thanks in advance.