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555-230-024
A-48 Issue 5 January 1998
DEFINITY ECS provides 3 levels of QSIG functionality:
■ Basic Call Setup — Supports basic call setup and number transport
■ Basic Supplementary Services — Supports Name Identification Services,
Call Forwarding (Diversion), and Call Transfer
■ Supplementary Services with Rerouting — Supports Call Forwarding
(Diversion) with Reroute and Call Transfer with Path Replacement
QSIG Call Forwarding (Diversion)
QSIG Call Forwarding (Diversion) is based on the DEFINITY ECS Call Forwarding
feature. It extends the feature transparency aspects of Call Forwarding over a
QSIG trunk:
■ If QSIG Call Forwarding is activated, all calls are diverted immediately.
■ If QSIG Call Forwarding with busy/don’t answer is activated and a station
is busy, a call is diverted immediately.
■ If QSIG Call Forwarding with busy/don’t answer is activated and a station
is idle but the call is not answered, a call is diverted after a specified
number of rings.
These features are activated either by dialing a feature access code or by
pressing a button. See Call Forwarding for detailed descriptions of how to use
these features.
This feature applies to all QSIG Call Forwarding features. A forwarded call can be
rerouted in a private network to find a more cost-effective or resource-efficient
path.
QSIG Call Forwarding (Diversion) provides additional call information to both the
caller and the diverted-to station above what is provided if the call is forwarded
over a trunk that is not administered for QSIG Supplementary Service Protocol b.
QSIG Call Offer
This feature, on request from the calling-user (or on that user’s behalf), enables a
call to:
■ Be offered to a busy called-user
■ Wait for a busy called-user to accept the call when the necessary
resources have become available.
QSIG Call Transfer
QSIG Call Transfer is based on the current DEFINITY ECS Transfer and
Trunk-to-Trunk Transfer features. QSIG Transfer signaling occurs as long as one
of the calls involves a QSIG trunk between the two switches. QSIG Transfer con-