Ringing signal not receiving

Greetings everyone,

I find myself encountering an issue within my setup that involves two servers: Server A and Server B. Recently, I established a trunk from Server A to Server B. Server B is further connected to an operator trunk. Both servers operate using Asterisk with FreePBX.

The crux of the issue lies in the call flow: when initiating a call from Server A (via a softphone) through the trunk, Server B successfully receives the call and forwards it to the operator. However, here’s the snag: although the operator sends a ringing signal back to Server B, FreePBX fails to reflect this on Server A when inspecting through sngrep.

I hope I’ve conveyed the situation clearly. Could someone kindly assist me in resolving this matter?
Thanks.