76 CHAPTER 2: D IAL P LANTo send a voice mail message to a user on another VPIM-compliantsystem, an NBX user first composes the voice mail message, using thecommands in the user’s voice mailbox. Depending on how the system’sdial plan is configured, the user can specify the destination in two ways:■ If the dial plan is configured for site codes, the user specifies thedestination site code followed by the extension of the person forwhom the voice mail message is intended.■ If the dial plan is configured without site codes, the user specifies theextension of the person for whom the message is intended. This iseasier, but requires that each site use a unique extension range fortelephones.■ A user who knows the IP address of a VPIM-compliant voice mailsystem and the extension of a person who uses that system cancompose a voice mail message and then send it using these steps:■ Dial the IP address, pressing the * key after each field in theaddress, including the last field.■ Dial the extension of the person followed by #.The system administrator configures the dial plan and decides whether touse site codes or unique extension ranges.Configuring theDial Plan for VPIMTo fully define a VPIM connection between two NBX systems, you mustcreate entries in the dial plan for the following items:■ The digit sequence that a telephone user must dial to access the VPIMconnection■ The route number that is used to access the other NBX system■ The extension list to which the VPIM route belongs■ The operations that must be performed on the dialed digits in order tocreate the appropriate outgoing digit sequenceFigure 9 contains sample lines which, when added to an existing dialplan, implement VPIM connections to two other NBX systems, one inAtlanta and one in Dallas. Table 15 explains each entry.
