Symptom
When outer-office user A dials IAD user B, user B's phone rings, and user A can hear the RBT. However, user B cannot hear user A's voice after user B picks up the phone.
Cause
The signaling carries events that the IAD does not support.
Solution
Capture packets on the faulty IAD.
Analyze the packets captured on the faulty IAD. Check whether the IAD sends a 518 error code to the softswitch.
icon-note.gif NOTE:
The IAD does not support softswitch messages that contain FXR/T38 events. Commo****CX messages do not contain FXR/T38 events.
If yes, change the T38 mode to transparent transmission mode for the softswitch.
If no, go to 3.
Contact Huawei technical support.
