One way audio in incoming call

[amatta]

Hello,
We are observing a strange behavior only in incoming call. While I can hear the caller, the caller cannot hear me. Outbound calls work perfectly fine without issues. Attached capture file from 3CX.
thank you!

 

[Alphabetic]

Sounds like a firewall issue.

 

[amatta]

Thanks for the quick revert.
If it were to be firewall issue, I think it will be impacting outbound calls also. But outbound calling works perfectly fine.
Made changes to firewall to allow all inbound SIP provider to 3CX to same behavior. The problem persists.

 

[Nathan@Voxtelesys]

If you re-run the firewall checker from the MGMT Console, does it pass?

 

[JebCassidy]

Hello! We have also been experiencing the same issue. The firewall checker passes and we have configured the firewall according to https://www.3cx.com/docs/ports/

Was there a resolution for this issue?

 

[Alphabetic]

Hello! We have also been experiencing the same issue. The firewall checker passes and we have configured the firewall according to https://www.3cx.com/docs/ports/

Was there a resolution for this issue?

How're your phones provisioned and what is your network topology?