
66 Chapter 2 System telephony networking overview
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Table 7 shows examples of the construction of numbers used when dialing within the example
network. Note that 6 is the Private Access code.
Figure 11 DPNSS networking
Calls are dialed and identified to the system as follows:
• To reach a telephone inside the Private Network, at the BCM site, the user dials the DN of
choice.
• To reach a telephone inside the Private Network, from another site, the user dials HLC + DN.
• To reach a telephone outside the Private Network, the user dials an Access Code + HLC + DN.
Each node has its own destination (dest) code, which includes the appropriate access and HLC
codes to route the call appropriately.
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
BCM Site D
DN # 2229
Extension 2222
LOC # 848
BCM
Site C
DN # 3333
LOC # 496
BCM
Site B
DN # 2222
LOC # 668
Terminating
BCM Site A
DN # 111
LOC # 244
Meridian M1
LOC # 563
Private
Network
DPNSS
DPNSS
DPNSS DPNSS
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