This section provides information about how the Uniform Dial Plan (UDP) feature interacts with other features on the system. Use this information to ensure that you receive the maximum benefits of Uniform Dial Plan in any feature configuration.
Automatic Alternate Routing (AAR)
AAR routes UDP calls. The AAR subset is included with the UDP. If AAR and UDP are both enabled on your system, the 7-digit AAR number provides the same routing as the UDP.
Dial Plan
Extension numbers on a server do not need to be part of a UDP. When extension numbers are not part of a UDP, the server software uses a non-UDP to handle calls that are associated with those extensions.
When you administer the Dial Plan and designate a group of extensions as UDP nonlocal, you can specify either that the software search for local extensions first, or search for local extensions last.
Direct Inward Dialing (DID) trunk group
DID calls to a UDP extension number might require the DID trunk group to insert the necessary digits to create the full extension number. For example, if the DID trunk provides 4 digits, but a 5-digit UDP is in place, the DID trunk group must insert the appropriate leading digit.
Distributed Communications System (DCS)
UDP is required when DCS is provided. The necessary UDP software is provided with the DCS software.
Extension Number Portability (ENP)
If you administer a user extension to use ENP node routing, ENP routes the call to the correct server.
If you enable both AAR and UDP, the 7-digit AAR number provides the same routing as UDP. The 7-digit AAR number uses ENP to route the call.
