Page 50 of 254 Dialing Plan configurationNN43001-308 Standard 01.02 May 2007On-net dialing planThe SRG only supports only one dialing plan option at a time. CDP and UDPdialing plan options cannot be configured at the same time in the samesystem.The SRG supports the following dialing plans:• Coordinated Dialing Plan (CDP) – BUID is the same as the DirectoryNumber (DN)• Uniform Dialing Plan (UDP) – Location code is added to the DN for theBUIDNortel recommends that the SRG use CDP.CDP Terminal Numbers (TNs) can be activated on the other systems if theuser moves and wants to retain their phone number. SRG does not supportTransferable Directory Numbers (TNDN) due to differences in dialing plansand the small range of DNs available on the SRG.For specific examples for CDP and UDP dialing plans, see “Dialing planexamples” on page 75.Once the call is sent over the IP network, the call is routed to the SRG, whichuses the NRS (H.323 Gatekeeper) to route the call. The NRS (H.323Gatekeeper) translates the address form a telephone number to an IP address,and authorizes the call.Specific dialing plan configuration is required for IP Phones to properlyselect a main office or a branch office that provides access to the PSTN forthe originating IP Phone. A common configuration might be:• SRG users select the SRG PSTN for local calls.• Main office users select the main office PSTN for local calls.• All users select either the main office or SRG PSTN for long-distancecalls to minimize toll charges.• calls configured to minimize toll charges.
