FEATURES GUIDE

General Features
Features Guide 135
Integrated Services Digital Network (ISDN) Extension
Description
ISDN extensions include ISDN terminal units such as ISDN telephones, facsimiles or personal
computers which are connected to each ISDN (BRI) ports. A maximum of 8 terminal units can
be connected to each ISDN (BRI) port with point-to-multipoint configuration. However, only
up to 2 units can be used simultaneously. To user ISDN extension lines, an external or an
internal power supply is required. Terminal equipment can be addressed individually with
Multiple Subscriber Numbers (MSN). The MSN consists of the ISDN extension number and
an additional digit, 0 through 99. If MSN is not assigned, all equipment on the same ISDN
(BRI) port are called simultaneously.
The following bearer capabilities can be supported:
The functions of terminal equipment are similar to single line telephone functions as below:
Transfer Mode
Circuit
Circuit
Circuit
Transfer Capability
Unrestricted digital
Speech
3.1 kHz Audio
Features Available for ISDN Extension
Absent Message Capability
*1
Account Code Entry
Automatic Station Release Budget Management
*1
Built-in Voice Message
*2
Call Hold — CO Line
Call Hold — Intercom Call Hold Retrieve — CO Line
Call Hold Retrieve — Intercom Call Hold, Exclusive — CO Line
Call Hold, Exclusive — Intercom Call Park
Call Pickup Deny
*1
Call Pickup, CO Line
Call Pickup, Directed
*1
Call Retrieving, Telephone Answering
Machine (TAM)
*3
Call Splitting Call Transfer, Screened — to CO Line
Call Transfer, Screened — to Extension Call Transfer, Unscreened — to Extension
Calling/Connected Line Identification
Presentation (CLIP/COLP)
*1
Calling/Connected Line Identification
Restriction (CLIR/COLR)
*1
Class of Service (COS)
*1
Conference
Department Codes
*1
Do Not Disturb (DND) for Intelligent Call
Handling 1:1 Call
*1
Doorphone Call
*4
Electronic Station Lockout
*1