Home DN (Directory Number) dialing via the PNP (Private Numbering Plan) allows digit-based dialing between subscribers to be kept and controlled within the logical confines of the PNP in which the calling subscriber is defined.
It can be used to process calls both within a PNP, between PNPs in the same BG (Business Group), and even between BG defined in Lotus Sametime Unified Telephony.
This type of dialing mirrors the configuration of routing strategies for calls made to external gateways/endpoints, and does not leverage the usage of the PNP location codes and extension tables. Instead, it allows an extremely quick and minimal configuration to simply route the calls to the proper home DN table without any retention of extension-to-extension dialing mechanisms that may be required by external applications and endpoints.
Use of this method require a PNP PAC (Prefix Access Code) to be defined for the digits that a subscriber must dial; then, required translations are performed that are necessary to normalize the digits to access the proper home DN table. This includes setting the NoA (Nature of Access) to the proper setting (International, National, and so on) that carries forward into the destination code table of the PNP. From the PNP PAC, the now normalized digits are sent directly to a PNP destination code that forwards them immediately to the global Home DN table for the subscriber dialed.
Parent topic: Routing and Translation