SIP Trunk: Avaya Extensions Can not hear 3CX Users

[Anyingisye Maseta]

We have setup SIP Trunk between 3CX and Avaya IP Office 500 V2. 3CX Users can call Avaya Extensions and when connected 3CX Users can also hear Avaya users, but Avaya Users cannot hear 3CX Users. What could be an issue?

 

[NicholasP_3CX]

Most likely audio is being blocked from the PBX to the Avaya. Check any network devices between them that may be blocking this.

PErform a capture on the PBX to see that the audio streams are flowing from the PBX, and on which ports and configure your firewall/router accordingly.