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NEAX2000 IVS
2
ISDN System Manual
Page 6 ND-70919 (E), Issue 1.0
CHAPTER 1 GENERAL INFORMATION
System Outline
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).
Figure 1-3 shows an example of using the VPN.
Figure 1-3 Example of ISDN-VPN (1 of 2)
• When an opposite office can interface with the ISDN network
PBX
B
(034567-8910)
PBX
A
Calling Party
Dial 1234
Called Party
ISDN
0345678910 (Office No.)
1234 (Called Party Subaddress)
Station No. 1234