eSpace IAD
Troubleshooting
2 Analyzing and Rectifying Faults
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
2.1.19 When the IAD Is Directly Connected to the IMS, Blind
Transfer or Transfer upon Inquiry Failed
Symptom
When the IAD is directly connected to the IMS, blind transfer or transfer upon inquiry failed.
User A makes a call to user B (IMS user). The call is transferred to user C through the blind
transfer or transfer upon inquiry service. When user B hangs up, users A and C are
disconnected.
Cause
The possible cause is that signaling interaction is abnormal.
Solution
Step 1 Capture IAD packets to analyze the signaling stream. Normal signaling messages and
signaling messages generated when the fault occurs have different TEL URI in the from and
to fields. IMS messages do not support TEL URI.
Step 2 Run the sip soft-parameter support-telurl off command to disable support-telurl.
Step 3 Check whether the fault is rectified.
If yes, the procedure ends.
If no, go to Step 4.
Step 4 Contact Huawei technical support.
----End
2.1.20 Calls Between IAD Users Are Disconnected Sometimes
Symptom
A SoftCo9500 and 23 IADs are connected to the external network through the PRA trunk.
Calls between IAD users or Outer-Office users are sometimes disconnected. The line
disconnected is random. When a call is disconnected, a registration failure occurs on the IAD,
but is automatically rectified in 10 seconds.
Cause
The possible cause is that the softswitch restricts the registration message traffic, resulting in
registration of multiple times.
Solution
Step 1 Capture and analyze IAD logs. If the softswitch does not respond to the registration message
sent by the IAD, the IAD sends a BYE message to terminate the session and re-sends
registration messages until the registration is successful.
Step 2 Check whether the traffic is restricted on the softswitch.
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