Voice over IP (VoIP) supports the redirecting call feature of the VoIP gateway for ISDN calls. The redirecting number is an optional field of the Q.931 setup message. When a local exchange carrier (LEC) switch detects an incoming call that is destined for a busy or non answering party, the switch formulates a Q.931 setup message with the redirecting number field set to the original destination number and sends it to the gateway. The called party number of the setup message will be set to one of the destination number (Dialed Number Identification Service [DNIS])access numbers of the gateway. If a redirect number is present on an incoming call, it is used in place of the DNIS. To configure ISDN redirect number support, see the ?Dial Plans, Dial Peers, and Digit Manipulation? chapter.
The above documentation comes from Cisco?s manual.
I am trying to find someone who can provide a template or configs on how to configure CCM/Gateway to recognize the RDNIS from the PRI call setup. Nothing can be found on CCO.