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Failure to Call Inter-Office Users When the SoftCo Connects to the IMS

Publication Date:  2015-07-15 Views:  416 Downloads:  0
Issue Description
When the SoftCo connects to the IMS, inter-office calls may fail to be set up sometimes.

When a SoftCo user calls an inter-office user, the SoftCo user can hear the Ringback Tone (RBT) but the call is not set up. The IMS sends error message 422 to the SoftCo.
Handling Process
Step 1 Run the config modify sip parameter sessioninterval 1800 command to change the SoftCo heartbeat interval to 1800.

Step 2 If the fault persists, contact Huawei technical support engineers.

Root Cause
The SoftCo's heartbeat interval is different from that of the IMS.