Flow of a Call through a Cisco CallManager Route Pattern
Route Pattern
(1)
Route List
(2)
Route Group
(4)
Route Group
(3)
Calling
Party
(A)
Destination
(B)
WAN
PSTN
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Route Pattern
A route pattern is the addressing method that identifies the dialed number and
uses route lists and route group configurations to determine the route for call
completion. Dialed numbers (E.164 North American Standard) are broken down
into smaller groups, creating route patterns that can be entered into the Cisco
CallManager as a specific number (for point-to-point direct dialing) or as a
number range (the more common implementation). By using a route pattern,
you can summarize a large range of numbers so minimal entries are needed to
route a call.
As a dialed number is routed, the CallManager will look to create a pattern
match, so the call can be correctly routed to the next hop and eventually to the
end devices. Keep in mind, the digits can still be changed by the CallManager
before they are put into the route list. By this method, numbers can be added or
subtracted to the dialed strings. Once the number is passed to the route list, it
will determine which route it will take to its next route groups (also trunk
groups) and prioritize the traffic and connections.