Hi, 3CX v15.5 is running on Debian 9 and installed on a local machine. Two phones (T48G and W56P) are attached to the same local network as the PBX is. Both phones are provisioned with the codec order: G722,PCMA,PCMU,G729. PBX delivers audio is off. What I understand is the codec priority is determined by the offeror, so when an extension calls another extension and there is not PBX delivers audio then the codec priority will be determined by the extension that initiates the call…, but this does not happen. The used codec at the destination is always PCMU while the offeror uses a other codec, e.g G722,G729,etc. Activity log is switched to Verbose mode and also here you can see the PBX offer only the PCMU codec when calling the extension. Switching PBX delivers audio on/off has no effect. Possible bug or did I miss I something? Please advise. Thank you.