eSpace IAD
Troubleshooting
2 Analy zing and Rectify ing Faults
Issue 02 (2012-02-29)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
9
SBC. UDP packets bear the voice packets. When the traffic is high, the SBC discards the UDP
packets that bear voice packets. Then one-way audio occurs.
Step 3
Disable the defense against UDP Flood attacks for the SBC.
Step 4
Check whether the fault is rectified.
If yes, the procedure ends.
If no, go to
Step 5
Contact Huawei technical support.
----End
2.1.2 Voice Tremble Occurs During IAD Calls
Symptom
Voice tremble occurs during IAD calls.
Cause
Phone fault
Poor bearer network performance that causes the packet loss between the IAD and the
peer gateway device
Incorrect configuration for the Ethernet port on the IAD upper-level switch
Solution
Step 1
Change a phone, and check whether the fault is rectified.
If yes, the procedure ends.
If no, go to
Step 2
Ping the peer gateway device on the IAD to verify the network performance. If the delay time
is less than 40 ms, and no packet loss occurs, the bearer network performance is good.
Step 3
Ver ify that each device that the media stream passes is configured to the full-duplex mode.
If a device is configured to the full-duplex mode, and the other device is configured to the
automatic adaptive mode, the working mode may become half-duplex after negotiation, which
affects the voice quality. You can configure the working mode to the full-duplex at a speed of
100 Mbit/s.
Step 4
Check whether the fault is rectified.
If yes, the procedure ends.
If no, go to
Step 5
Contact Huawei technical support.
----End