When the IAD Is Connected to the IMS, Users Cannot Make Calls to Each Other

Symptom

When the IAD is connected to the IMS, users cannot make calls to each other.

Possible Cause

The possible cause is that signaling interaction is abnormal.

Solution

1. Capture IAD packets to analyze the signaling stream. If the IMS returns an error response message to the IAD INVITE message, the IMS does not support the URI TEL format that is used by the INVITE message.
2. Run the sip soft-parameter support-telurl off command to change the TEL format to SIP format.
3. Check whether the fault is rectified.
   • If yes, the procedure ends.
   • If no, go to step 4.

4. Contact your service provider for assistance.