4.3.3 ISDN Virtual Private Network (ISDN-VPN)
Description
ISDN Virtual Private Network (ISDN-VPN) is a service provided by the telephone company. It uses an existing
line as if it were a private line. There is no need to set up a private line or to lease a line from the telephone
company. Making and receiving both public and private calls is possible using the same line.
Public/Private Discrimination:
a. When making a call: The public/private discrimination number is required before sending the dialled
number to the telephone company. The public/private discrimination number can be dialled manually, or
automatically by ARS programming (® 2.8.1 Automatic Route Selection (ARS)) and/or TIE line service
programming.
b. When receiving a call: The telephone company distinguishes the call type. If it is a private call, the call is
received by the TIE line service method. If it is a public call, the call is received by the Incoming Trunk Call
Distribution method (DIL/DDI/MSN) which is assigned on the trunk.
[Example]
Conditions
• Each BRI/PRI port can be set to public or VPN through system programming. To use this service, select
VPN.
• Even if the telephone company does not support the ISDN-VPN service, it is possible to use the same kind
of service when making a call by TIE line service programming, and/or Quick Dialling programming
(® 2.6.5 Quick Dialling).
390 Feature Guide
4.3.3 ISDN Virtual Private Network (ISDN-VPN)
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