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28 User Manual
2.1.2 For ISDN Extension Users
ISDN extensions include ISDN terminal equipment such as telephones, facsimiles or personal
computers connected to the ISDN (BRI) port (port 2 and port 3) on the main unit KX-TD612. A
maximum of 8 ISDN extensions can be connected to each ISDN (BRI) port with point-to-multipoint
configuration. However, only 2 units can be used simultaneously. Terminal equipment can be
addressed individually with Multiple Subscriber Numbers (MSN). The MSN consists of the ISDN
extension number and an additional digit, 00 through 99. If MSN is not assigned, all equipment on
the same ISDN (BRI) Extension bus are called simultaneously.
• A primary and a secondary Class of Service (COS) can be assigned per port.
To Central Office
ISDN Extensions
Network
Termination