1.19 Integrated Services Digital Network (ISDN) Service FeaturesFeature Guide 1471.19 Integrated Services Digital Network (ISDN)Service Features1.19.1 Integrated Services Digital Network (ISDN)1.19.1.1 Integrated Services Digital Network (ISDN)—OVERVIEWDescriptionIntegrated Services Digital Network (ISDN) is a digital switching and transmission network. ISDN transmitsvoice, data, and image in digital format. ISDN lines can be connected to public line (CO line) or private line(QSIG).1. ISDN Interface and Configuration2. ISDN Supplementary Services for Public Network3. Private Networking Connection (QSIG)Private networking with QSIG is possible using an ISDN line. Each ISDN port must be programmed sothat each ISDN line has a "master" connection and a "slave" connection.Interface Type Description Port ModePrimary Rate Interface(PRI)Provides twenty-three 64 kbps B channels forcommunication and one 64 kbps D channel forsignaling (23B + D).CO Line, QSIG—Master, QSIG—SlaveService Description Details inDirect Inward Dialing(DID)Directs a call with a DID number to thepreprogrammed destination.• 1.1.1.3 DirectInward Dialing(DID)Calling Line IdentificationPresentation (CLIP)Sends the caller's telephone number to the networkwhen making a call. The called party can see thenumber on his or her telephone display beforeanswering the call.• 1.19.1.2 CallingLine IdentificationPresentation(CLIP)Calling Line IdentificationRestriction (CLIR)Prevents the caller's CLI from being presented to thecalled party.Caller ID The PBX receives Caller ID information, such as thecaller's name and telephone number, when a call issent from the network. A display proprietarytelephone (PT) user can see this information beforeanswering the call.• 1.16.1 Caller ID
