2. Echo Cancellation
Try to disable or enable the Echo Cancellation on the port settings. Specically for the FXS/GSM/FXO ports.
And see if the issue persists.
3. FXO Mode
If you don't know which one to choose. You can try FCC, or TBR21 (For European countries) https://en.wikipedia.org/wiki/TBR21
4. GSM Module Detection Method
DTMF Detection Failure of TG Gateway - Change the DTMF Detection Mode
5. Feature Code Impact
Feature Code Detection Leads to the Door Phone DTMF Sending Delay
6. SIP DTMF Mode
Try to check the DTMF mode for the call by following this article: Understand the DTMF in SIP Call
Then configure the proper the DTMF mode for SIP extension or SIP trunk according to your practical case.
7. SIP DTMF event compatibility
DTMF Recongnition Failure in IVR due to Payload Negotiation Failure
8. Mobile Audio Coding
DTMF from Mobile Detection Failure due to the Mobile Audio Coding
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