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Call forwards from the IP Phones which are registered to Cisco CallManager Express to PSTN numbers fails
The CallManager Express system fails to forward calls to Public Switched Telephone Network (PSTN) numbers. The debug voice ccapi ino command output shows that everything is good until the call is disconnected. The disconnect reason is listed as Transfer Number Is Null.
Use the show ephone cfa command in order to list registered ephones that have call-forwarding-all (cfa) activated on one or more ephone-dns.