No Audio for incoming call on Telstra Mobile

[nfonz23]

We are having a strange issue where phone calls from Telstra or Vodafone on a mobile phone (in Australia) come through to 3CX, hit our IVR, but the caller doesn't hear anything. I replicated the issue with my mobile phone.
We use the hosted 3cx on version 20. Calls from a landline on Telstra or other mobile networks seem to work fine.
Would this be a SIP provider issue? (We use maxotel).

 

[TheodorosG_3CX]

This indeed can be related with the provider so you might need to also contact them first.
Calling internally between extensions you have the same issue?

 

[KyriacosS_3CX]

And you can use the Call Quality monitoring and the new Check SIP Trunk tools to gather information on the calls and trunk, to provide to your provider and speed resolution.