Considerations for Uniform Dial Plan

Last Updated : Oct 30, 2012 |

This section provides information about how the Uniform Dial Plan (UDP) feature behaves in certain circumstances. Use this information to ensure that you receive the maximum benefits of Uniform Dial Plan under all conditions.

  • In North American network environments, the system routes extensions that start with 0 to an attendant. Avaya recommends that you use a digit other than 0 as the leading digit when you assign extensions.

  • When you call an extension that is on another server, you might experience slight delay before you hear call-progress tones. This delay is caused by the trunk signaling that is necessary to complete the call to the remote media server or to the switch.

  • When you select the option that causes the software to look at the UDP table first, the system routes calls that might otherwise terminate at a local extension, over the network. If you do not want the system to route calls over the network, you must remove the extensions from the UDP table. Once you remove the extensions from the UDP table, users can dial the local extension.

  • If Automatic Alternate Routing (AAR) is active, the software sends facility restriction levels (FRLs) and Traveling Class Marks (TCMs) with the private network number. UDP Code and AAR Code conversions use the FRL that is assigned to the caller. Extension number portability (ENP) Node conversion always raises the FRL to the maximum of seven.

    If an FRL is insufficient to access the facility, the system denies access. The system does not prompt for an authorization code, even if authorization codes are enabled and administered in your system.

  • If AAR is inactive, do not equip your system to use tandem-tie trunks to transport UDP numbers. You should not use tandem-tie trunks to transport UDP numbers, because the termination server does not recognize the TCM.

    Avaya recommends that you never use tandem-tie trunks to transport UDP numbers. When you use tandem-tie trunks to transport UDP numbers, the receiving media server or the system does not recognize the TCM and the hop count that follow the extension.