Administrator's Guide

Call-by-call service selection
Issue 5 October 2002 1629555-233-506
Considerations
■ An analog telephone user must place the active call on soft hold and dial
the Answer Hold-Unhold feature access code to answer the waiting call.
■ If an analog single-line telephone has Call Waiting enabled and has
initiated a conference call, Call Waiting is denied. For example, caller A
(on an analog telephone) is talking to caller B, then flashes and is talking to
caller C, and then flashes to conference B and C. Then, if caller D attempts
to call caller A, Call Wait is denied.
Interactions
Call Waiting is denied when the following features are activated at the single-line
telephone:
■ Another Call Waiting Call
■ Automatic Callback (to or from the telephone)
■ Data Privacy
■ Data Restriction
A Call Waiting call cannot be picked up by a Call Pickup group member or by
directed call pick-up.
Call-by-call service selection
Call-by-Call Service Selection enables a single ISDN trunk group to carry calls to
a variety of services. It does not require that each trunk group be dedicated to a
specific service. It allows you to set up various voice and data services and
features for a particular call.
Call-by-Call Service Selection provides the following benefits:
■ Cost reduction — Since many services share the same trunks, the total
number of trunks can be reduced.
■ Improved service — Features and services are less likely to be blocked.
■ Simplified Networking — Network engineering is simplified because
analysis of trunking needs can be done based on total traffic instead of on a
per-service basis.
■ Timely response to changes — With Usage Allocation Plans (UAPs), the
network does not have to be consulted.
■ Measurement of Call-by-Call Service Selection calls