Outgoing calls can be made, but incoming calls fail to be connected on the AR using a SIP IP trunk. Why

Check whether the incoming prefix is correctly configured.
1. Check whether the remote IP address and port number of the SIP IP trunk are correct.
2. Check whether the configuration is valid. Run the display voice trunk-group trunk-group-name command to check trunk group information.
3. Verify that the local incoming prefix and incoming number change rules are correct.
4. Verify that the peer outgoing prefix and route number change rules are correct.

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