Automatic Call Distribution (ACD) basics
22 Communication Manager Guide to ACD Call Centers
Communication server features
This section defines ACDs and explains how they work. The section contains the following
topics:
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Trunks, trunk groups, and extensions
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Automatic-in processing definition
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The attendant
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communication server with attendant and extensions
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Direct Inward Dialing processing with an example
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Automatic-in processing of ACD calls
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DID processing of ACD calls
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Call processing on an ACD communication server.
What a communication server does
A communication server is an electronic device that processes incoming, outgoing, and
internal calls and connects them to the proper destinations. The telephone company
communication server in your local area is called a Central Office (CO). A communication
server owned by a company or organization processes incoming, outgoing, and internal
calls. Throughout this chapter, the term communication server is used to refer to a
company or organization’s communication server.
Trunks, trunk groups, and extensions
Incoming calls to a company first pass through the CO. The CO sends calls to the
company communication server over trunks (telephone lines that carry calls between two
servers, between a CO and a server, or between a CO and a phone).
The CO receives dialed digits from the caller, processes the digits, and seizes a trunk that
is assigned those digits. After the CO seizes a trunk, it sends a continuing transmission to
the destination phone or communication server, and no other calls can be sent over that
trunk until the current call disconnects.
Since a trunk can carry only one call at a time, trunk groups are usually created. A trunk
group is a group of trunks that are assigned to the same digits. With a trunk group, the CO
receives the digits of a dialed phone number and checks the trunk group assigned to that
number to see if any of the trunks are available. The CO then seizes an available trunk. As
many simultaneous calls can be made over a trunk group as there are trunks in that trunk
group. A trunk group, therefore, can carry multiple calls for the same phone number. When
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