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How to avoid forwarding loops in Cisco Unity
In order to avoid forwarding loops in Cisco Unity, use these features in the Advanced Setting tool:
System - Reject Forwarded Notification DTMF Tone
This setting defines the 4th-column DTMF tone (A, B, C, D) that Cisco Unity uses in order to detect forwarded message notification calls so that they can be rejected and not answered, which prevents an endless loop.
If a user turns on message notification and sends message notification calls to a device that in turn automatically forwards to Cisco Unity when calls are not answered, Cisco Unity detects that the forwarded call was originally sent by Cisco Unity as a message notification and does not answer it. Because the caller ID of the original notification call can be lost, Cisco Unity detects message notification calls that are forwarded back with the 4th-column DTMF tone that is specified in this registry key located at: