1.19 Integrated Services Digital Network (ISDN) Service Features
Feature Guide 147
1.19 Integrated Services Digital Network (ISDN)
Service Features
1.19.1 Integrated Services Digital Network (ISDN)
1.19.1.1 Integrated Services Digital Network (ISDN)—OVERVIEW
Description
Integrated Services Digital Network (ISDN) is a digital switching and transmission network. ISDN transmits
voice, data, and image in digital format. ISDN lines can be connected to public line (CO line) or private line
(QSIG).
1. ISDN Interface and Configuration
2. ISDN Supplementary Services for Public Network
3. Private Networking Connection (QSIG)
Private networking with QSIG is possible using an ISDN line. Each ISDN port must be programmed so
that each ISDN line has a "master" connection and a "slave" connection.
Interface Type Description Port Mode
Primary Rate Interface
(PRI)
Provides twenty-three 64 kbps B channels for
communication and one 64 kbps D channel for
signaling (23B + D).
CO Line, QSIG—
Master, QSIG—
Slave
Service Description Details in
Direct Inward Dialing
(DID)
Directs a call with a DID number to the
preprogrammed destination.
• 1.1.1.3 Direct
Inward Dialing
(DID)
Calling Line Identification
Presentation (CLIP)
Sends the caller's telephone number to the network
when making a call. The called party can see the
number on his or her telephone display before
answering the call.
• 1.19.1.2 Calling
Line Identification
Presentation
(CLIP)
Calling Line Identification
Restriction (CLIR)
Prevents the caller's CLI from being presented to the
called party.
Caller ID The PBX receives Caller ID information, such as the
caller's name and telephone number, when a call is
sent from the network. A display proprietary
telephone (PT) user can see this information before
answering the call.
• 1.16.1 Caller ID