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1.20 Integrated Services Digital Network (ISDN) Service Features
198 Feature Guide
1.20.1.11 ISDN Extension
Description
An ISDN (BRI/PRI) port can be used for either trunk or extension connection. When extension
connection is enabled, ISDN terminal devices (e.g., ISDN telephone, G4 fax machine, personal
computer) or a behind PBX can be connected to the port.
If the ISDN port is in point-to-point (P-P) configuration, one terminal device can be connected
to the port. If the ISDN port is in point-to-multipoint (P-MP) configuration, a maximum of eight
terminal devices can be connected to the port. However, only a maximum of two devices can
be used simultaneously.
Individual terminal devices on a behind PBX can be addressed with Multiple Subscriber
Number (MSN). The MSN consists of the ISDN extension number and an additional digit, 0
through 9 or 00 through 99.
[Example]
Conditions
• Subaddressing
Subaddressing is possible between ISDN terminal devices. The subaddress goes through
the PBX to the ISDN terminal devices directly.
• Call Transfer (PBX feature) is available only for ISDN extensions in P-MP configuration.
( 1.11.1 Call Transfer)
(131)
Extn. No.: 13X (MSN)
Extn. No.: 14XX (MSN)
Extn. No.: 15XX
(MSN)
PBX
(132) (139)
...
...
Behind
PBX
(1234)
Extn. No.: 1234
ISDN Port for
EXTN. (P-MP)
(1234) (1234)
...
...
1234:
Up to eight terminals
can be connected to
the port and receive
a call simultaneously.
131–139:
Up to eight terminals
can be connected to
the port.
130:
All terminals receive
a call simultaneously.
(1400) (1401) (1499)
...
...
1400–1499:
Each terminal
receives a call.
(Use the DDI/MSN
feature of the
behind PBX.)
Idle Extension
Hunting is available.
ISDN Port for
EXTN. (P-P/P-MP)
ISDN Port for
EXTN. (P-P/P-MP)
ISDN Port for
EXTN. (P-MP)