Information Technology Reference
In-Depth Information
The building blocks of the CUCM dial-plan are simple and consistent. The potential for
complexity exists when multiple hierarchical paths are implemented, with different fea-
tures and capabilities enabled. This section identifies the core elements and explains their
interactions.
Call-Routing Sources in CUCM
A call-routing request (including but not limited to a simple phone call) can originate from
any of the following:
IP phone: Places a routing request using one of its configured lines. This may be a
manually dialed number, a speed dial, feature button, or softkey.
Trunk: Signals inbound calls from another CUCM cluster, CUCME, or other call agent.
Gateway: Signals inbound calls from the PSTN or another call agent, such as a pri-
vate branch exchange (PBX).
Translation pattern: Matches the original called digits and immediately transforms
them to a new dialed string. The new string is resubmitted to digit analysis for routing.
Voicemail port: Can be the source of a call-routing request if the application at-
tempts a call, transfer, or message notification on behalf of a user's mailbox.
A call-routing request is simply one of the previous entities signaling CUCM with a string
of dialed digits. These digits can be manually dialed by a user on their phone, automati-
cally by an application such as Cisco Unity Connection, or by another system via a trunk
or gateway.
Call-Routing Destinations in CUCM
The following are possible call-routing destinations in CUCM:
Directory Number (DN): Each button on an IP phone can be assigned a unique on-
net extension.
Translation Pattern: Matches a string of dialed digits and transforms them to a
new dialed string, which is in turn resubmitted to digit analysis and routed to a dif-
ferent target.
Route Pattern: Matches a set of dialed digits and triggers a call-routing process that
can include one or more potential paths, providing a hierarchical set of call-routing
options.
Hunt Pilot: A specific pattern of digits that, when matched, triggers a customizable
call-coverage system.
Call Park Number: A pattern or range of patterns that CUCM can use to temporar-
ily hold a call until a user dials the call park number to pick it up from any IP phone.
Meet-Me Number: The conference call initiator dials into the Meet-Me number to
begin the conference, and one or more other users dial into the same number to join
the conference.
 
 
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