Information Technology Reference
In-Depth Information
The pattern 131 matches exactly, but other patterns match, too; these other patterns are
longer, so CUCM has to wait to see if User C dials another digit. If she does, 131 no
longer matches and is discarded as a possible target. The wait time is set by the T.302 In-
ter-Digit Timeout value, which defaults to 15 seconds. If User C dials a fourth digit, the
T.302 timer starts again, because there is still a longer pattern that might match (“13!”). If
User C stops dialing after 4 digits, after 15 seconds (the T.302 timer wait), the call is ex-
tended to the target of the “13[0-4]X” pattern. If she dials another digit within the T.302
timer count, the “13[0-4]X” pattern is discarded because it no longer matches. When User
C finishes dialing, the T.302 timer must exhaust before the call is routed.
Key Concept:
Digit-by-digit analysis means that CUCM collects digits one at a time as
they are dialed. As digits are collected, patterns that no longer match the string are discard-
ed as possible routing targets.
The Closest Match logic will choose a pattern target according to the following criteria:
Key
To p i c
The pattern matches the dialed string.
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Among all the potential matches, it matches the fewest strings other than the ac-
tual dialed string.
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Hunt Groups
A
Hunt Group
is a set of IP phones (technically, the Directory Numbers [DN] on the
phones) that are able to be reached by calling a common number. The classic example is
the Helpdesk; users dial 7777, and all the DNs of the helpdesk staff ring in sequence until
one of them picks up the call.
The components of a Hunt Group are
Line Groups:
Contain the DNs that will be rung sequentially. The Line Group set-
tings allow the selection of the call-distribution algorithm: Top-Down, Circular,
Longest Idle, or Broadcast. The settings also control when, or if, to proceed to the
next available Line Group in the Hunt List.
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Hunt Lists:
Contain a top-down ordered list of Line Groups. Each new call is routed
to the first Line Group in the list; if that group cannot provide call coverage, the next
Line Group in the Hunt List is tried until the list is exhausted.
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Hunt Pilot:
This is a call-routing entry (much like a Route Pattern) that matches a di-
aled string and targets a Hunt List (which in turn targets a Line Group). Hunt Pilot
numbers may be on-net, E.164, or any format as required.
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Class of Control
Class of Control
is defined as the ability to apply calling restrictions to devices. Typical
examples might include the following:
Key
To p i c
Preventing certain individuals from placing long-distance calls
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Routing the same called number to different targets at different times of day
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Routing the same called number to different targets at different locations
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