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Telephony concepts
November 2004
Avaya Modular Messaging Concepts and
Planning Guide
8-11
Hunt groups
A hunt group is a pre-programmed collection of extensions that is
configured on the switch. A single pilot number presents a call to one of
the available ports within the hunt group. Hunt groups can be designated
for specific purposes, for example, incoming only or outgoing only. The
simplest hunt groups are linear (available ports are hunted in sequential
order).
When planning for Avaya Modular Messaging, use hunt groups to
balance the load on voice ports. This is important because multiple MAS
units can be installed with multiple telephony cards. For more
information, see Hunt algorithm
on page 13-12.
Types of hunt groups
Some common types of hunt groups are:
! Linear call distribution
Calls start at the first port. When the first port is busy with the
first call, the next call goes to the second port. If the first port
becomes free, the next call goes to the first port, and so on.
! Uniform call distribution (UCD)
Calls start at the first port. Subsequent calls go sequentially to the
second, third, and fourth ports, and so on, regardless of whether
earlier ports become available. The first port does not receive
another call until all ports have taken a call.
! Automatic call distribution (ACD)
Calls go to the port that has been idle the longest. For example, if
the first port has been idle for 30 seconds, the second for 50
seconds, and the third for 40 seconds, the first call goes to the
second port.
Note: Avaya recommends ACD only with Digital Set
Emulation integration using Nortel switches, and
when support for more than 18 ports is required.
Avaya does not recommend ACD with any other
integration.
! Circular call distribution
In circular call distribution, the switch has the ability to
remember the last busy port. When a call comes it goes to the last
busy port. Subsequent calls go to the first port in the group and
then sequentially go to the second, third, fourth ports, and so on.