
60 Chapter 2 System telephony networking overview
NN40020-603NN40020-603
Private networking with DPNSS
(International only)
DPNSS supports the Universal Dialing Plan (UDP), an international standard for sending and
receiving private numbers over networks. The UDP requires that a dialing number include the
following:
• a Private Access Code, programmed into the system as part of the destination code table to
prevent conflicts with the internal numbering system. (Access Codes)
• a Home Location Code (HLC) assigned to each PBX system, and configured as part of the
destination code (a maximum of seven digits). For each HLC, a destination code must be
programmed in the system. (Configuration > Telephony > Dialing Plan > Private
Networking)
• a Directory Number (DN) assigned to each extension as a line appearance. The DN appears as
the last string segment in a dialed number. In the number 244-1111, 1111 is the DN.
A typical Private Number, using a private access code and dialed from another site on the network,
appears below.
In this networking example, a private network is formed when several systems are connected
through a Meridian 1 and a terminating BCM system. Each site has its own HLC and a range of
DNs. Figure 11 illustrates this example.
Table 7 shows examples of the construction of numbers used when dialing within the example
network. Note that 6 is the Private Access code.
Private Access
Code
+ Home Location
Code
+ Directory
Number
= Calling Party
Number
6 + 848 + 2222 = 6-848-2222
Table 7 Calling numbers required for DPNSS network example
Calling Site LOC/HLC Calling Party
Number
Called Site Dialing String Called Party
Number
Site A 244 244 1111 Site B 6 668 2222 668 2222
Site B 668 668 2222 Site D 6 848 2222 848 2222
Site D 848 2222 Site D 2229 2229
Site C 496 496 3333 Public DN 9 563 3245 563 3245
Kommentare zu diesen Handbüchern