Cisco CallManager Dial Plans
.. By using Cisco CallManager, you can allow for greater growth and
functionality within your network because it was designed to be
integrated with IOS gateways.
.. The creation of dial plans for internal calls to IP phones are registered
within a Cisco CallManager cluster.
.. External calls use a route pattern to direct off-network calls to a PSTN
gateway. Route patterns can also be used if there are Cisco CallManagers
located on a WAN-connected network.
.. 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.
.. Digit manipulation involves digit removal and prefixes, digit forwarding,
and number expansion.
.. Route lists are configured to map the routes of a call to one or more
route groups.
.. Route groups allow you to control telephony devices.
.. Telephony devices are any devices capable of being connected to a route
group.
.. the digit translation table manipulates dialed digits and is supported
within Cisco Call Manager
.. Fixed-length dial peers versus Variable-length dial peers—This will help
you to decide what to use in your network.
.. Two-stage dialing occurs when a voice call is destined for the network,
and the router placing the call collects all of the dialed digits.