Lucent Technologies 555-230-024 manual Isdn

ISDN

Primary Rate Interface, referred to as 23B + D or 30B + D on an E1 interface, uses 23 or 30 64-kbps B channels and one 64-kbps D channel. The 23 or 30 B channels can be used for 23 or 30 individual voice or data calls. Basic Rate Inter- face, referred to as 2B + D, uses two 64-kbps B channels and one 16-kbps D channel. The B channels give the user simultaneous voice and data transmission over the same connection. This channel architecture allows full and complete use of the 64-kbps B channels from endpoint to endpoint for information movement managed by signaling messages, called Q.931 messages, in the D channel.

To help your business achieve maximum benefits from ISDN and the public net- work, the following features reside within AT&T’s ISDN service nodes.

■Call-by-Call Service Selection lets you reach multiple AT&T services via the same ISDN B channel. Therefore, a channel can be allocated among MEGACOM Wide Area Telecommunications Service, MEGACOM 800 Service, and other services on a dynamic basis, eliminating the need for dedicating each trunk or channel to a specific service.

■Automatic Number Identification, marketed as Information Forwarding-2 (INFO-2), is available on MEGACOM 800 Service. INFO-2 delivers the originating calling party’s billing number to your DEFINITY ECS. In a call center environment, DEFINITY ECS can pass this information on to a computer application via a computer-telephone integration interface to perform customer record lookups — thereby increasing agent productivity.

■Station Identification Number, similar to INFO-2, identifies the calling party number behind the switch. Station Identification delivers the originating caller’s telephone number to the network where it is sent to the terminating location.

555-230-024 Issue 5 January 1998 12-13