Huawei eSpace IAD - Phones Connected to the IAD Can Ring but Nothing Is Heard after Pickup; Phones Connected to IAD Cannot Make Calls to Fixed-Line Phones in a Specified Province

eSpace IAD
Troubleshooting
2 Analyzing and Rectifying Faults
Issue 02 (2012-02-29)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
12
----End
2.1.4 Phones Connected to the IAD Can Ring but Nothing Is
Heard After Pickup
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
Step 1 Capture packets on the faulty IAD.
Step 2 Analyze the packets captured on the faulty IAD. Check whether the IAD sends a 518 error
code to the softswitch.
The IAD does not support softswitch messages that contain FXR/T38 events. Common MDCX
messages do not contain FXR/T38 events.

If yes, change the T38 mode to transparent transmission mode for the softswitch.

If no, go to Step 3.
Step 3 Contact Huawei technical support.
----End
2.1.5 Phones Connected to IAD Cannot Make Calls to Fixed-Line
Phones in a Specified Province
Symptom
Phones connected to IAD cannot make calls to fixed-line phones in a specified province but
can make calls to fixed-line phones in other provinces. Fixed-line phones in the province can
make calls to phones connected to IAD properly.
Network:
POTS-A-IAD-ZTE NGN
Cause

Network exceptions

Incorrect digitmap configuration on the softswitch
Solution
Step 1 Check whether the IAD is properly registered with the softswitch.