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System Outline of ISDN-VPN
The Virtual Private Network (VPN) is a service which provides an interoffice private line via an ISDN
network.
When you dial a station number (Called Party Subaddress), the system sends a pre-assigned office number
of a called party together with the Called Party Subaddress to an ISDN network. With this function, an
interoffice call can be made by only dialing a station number (Called Party Subaddress).
The following figure shows an example of using the VPN.
• When an opposite office can interface with the ISDN network.
Dial 1234
Calling Party
Example of ISDN-VPN
PBX
0345678910 (Office No.)
1234 (Called Party Subaddress)
ISDN
A
– 9 –
CHAPTER 1 GENERAL INFORMATION
PBX
Station No. 1234
B
(034567-8910)
Continued on next page
SYSTEM OUTLINE
Called Party
NWA-008852-001 Rev.5.0
98ch1001.fm
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