1.21 Integrated Services Digital Network (ISDN)Service Features1.21.1 Integrated Services Digital Network (ISDN)1.21.1.1 Integrated Services Digital Network (ISDN)—SUMMARYDescriptionISDN is a digital switching and transmission network. ISDN transmits voice, data, and image in digital format.ISDN lines, if available, can be connected to public line (trunk), private line (QSIG), or ISDN terminal devices(extension).1. ISDN Interface and ConfigurationInterface Type Description Port Mode ConfigurationType*1Basic Rate Interface(BRI)Provides two 64 kbps Bchannels for communication andone 16 kbps D channel forsignalling (2B + D).Trunk, Extension Point-to-Point/Point-to-multipointQSIG (Master,Slave)Point-to-PointPrimary Rate Interface(PRI)Provides thirty or twenty-three64 kbps B channels forcommunication and one 64 kbpsD channel for signalling (30B +D/23B + D).Trunk, QSIG(Master, Slave),ExtensionPoint-to-Point*1 For BRI only:® [426] BRI ConfigurationNotePoint-to-Point (P-P):One ISDN terminal device can be connected to one ISDN port.Point-to-multipoint (P-MP):A maximum of eight ISDN terminal devices can be connected to one ISDN port.2. ISDN Supplementary Service Table for Public NetworkService Description & ReferenceDirect Dialling In (DDI) Directs a call with a DDI number to a preprogrammed destination.(P-P only)® 1.1.1.3 Direct Inward Dialling (DID)/Direct Dialling In (DDI)Multiple SubscriberNumber (MSN)One ISDN port can support a maximum of 10 MSNs for routingincoming calls. (P-MP only)® 1.1.1.4 Multiple Subscriber Number (MSN) Ringing ServiceFeature Guide 2071.21.1 Integrated Services Digital Network (ISDN)
