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Introduction
555-230-024
1-24 Issue 5 January 1998
■ Inbound Call Management
■ DEC Computer Integrated Telephony programming library
■ Computer telephony integration
DEFINITY ECS uses an analog line circuit to support voice adjunct and interface
functions such as:
■ Loudspeaker paging
■ Music-on-hold
■ Queue status indications
■ Recorded announcement
■ External alarm inputs
DEFINITY ECS supports an auxiliary trunk interface that connects to equipment
supporting features such as:
■ Recorded announcement
■ Music-on-hold
■ Loudspeaker paging
DEFINITY ECS supports typical network interfaces such as:
■ Electronic Tandem Network
■ Distributed Communications System — over either X.25 links or ISDN
temporary signaling connections
■ ISDN-PRI
Telephone Connections
All signals between analog telephones and the DEFINITY ECS are in analog form
over a pair of wires. Digital DCP telephones using the Digital Communications
Protocol employ digital transmission for integrated voice and data signals and
control signals. Transmission is over a connection consisting of one or two pairs
of wires. Each connection supports one signaling channel and two information
(voice and data) channels.
The 8400 digital telephones automatically detect whether they are plugged into a
two-wire or four-wire digital line circuit pack. The 9400 digital telephones provide
inexpensive support for two-wire installations. The 6400 digital telephones pro-
vide state-of-the-art features for two-wire installations. See Chapter 10, "Desktop
Solutions" for more information on telephones.
Like the digital DCP telephones, ISDN telephones transmit voice, data, and con-
trol signals digitally. With the ISDN telephones, the transmission employs the
world-wide standard BRI protocol between the DEFINITY ECS and the telephone.