![](/images/backgrounds/206171/bg527.png)
DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506 Issue 1
April 2000
Features and technical reference
1295Call-by-Call Service Selection
20
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 t o
caller C, and then flashes to conference B and C. Then, if c all er D at tempts
to call caller A, Call Wait is denied.
Interactions
Call Waiting is denied when the following features are activated at the sing le-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 UAPs, the network doe s not hav e to be
consulted.
■Measurement of Call-by-Call Service Selectio n calls