Instruction manual

DEFINITY® Business Communications System and GuestWorks® Issue 6
Overview
555-231-208
Issue 1
April 2000
Networking Solutions
9-13ISDN
9
The system also adds the following capabilities to the basic ISDN services,
depending on local availability of support.
■ Call-by-Call Service Selection, in addition to the services provided by this
feature on the network, allows each trunk in a PRI link from your system to
the local central office to be designated on a per-call basis as Direct Inward
Dial, incoming Wide Area Telecommunications Service, outgoing Wide
Area Telecommunications Service, and so forth. This eliminates the need
for dedicating each trunk or channel to a specific service, although they can
still be dedicated, if desired.
■ ISDN flow control monitors message activity on the Primary Rate Interface
D channel.
■ Non-Facility-Associated Signaling allows a PRI D channel to supply
signaling for B channels (voice and data) located on PRI interfaces other
than the one where the D channel is found. As a result, one D channel can
support call control and signaling for up to 20 Primary Rate Interfaces.
■ D Channel backup, when administered, improves reliability in the event of
a signaling link failure on a Non-Facility-Associated Signaling D channel
group. A primary D channel provides signaling for the Non-Facility-
Associated Signaling D channel group (two or more Primary Rate Interface
facilities). A second D channel, located on a separate Primary Rate
Interface facility of the same Non-Facility-Associated Signaling D Channel
group, is designated as a backup. If the primary D channel fails, call-control
signaling automatically transfers to the backup D channel.
By combining public network services and ISDN features with the system’s ISDN
and other features, you can differentiate your business from your competitors,
both in improved customer satisfaction and in greater operating efficiency. The
result is improved profits and reduced costs. Here is a brief glance at a few of the
possible ISDN applications:
■ Dealer locator
■ Product sourcing and fulfillment
■ Consumer-to-business and business-to-business data retrieval
■ Logging for callback.