92
D14049.03
MAY 2008
Grey Headline
(continued)
Search Process
The process followed by the VCS when attempting to locate a
destination endpoint is shown in the diagram opposite.
The user enters into their endpoint the alias or address of the
1.
destination endpoint. This can be in a number of
The destination address is sent from the caller’s endpoint to
2.
its local VCS (i.e. the VCS to which it is registered).
The VCS applies any Local Zone transforms to the alias.
3.
The VCS applies any Administrator Policy to the (transformed)
4.
alias. If this results in a new alias, the process starts
again, with the new alias checked against the Local Zone
transforms.
The VCS applies any User Policy to the alias. If the alias is a
5.
FindMe name, the process will start again; all the resulting
aliases will be checked against Local Zone transforms and
Administrator Policy.
The VCS then checks all its local registrations and those
6.
of its Alternates for the alias, placing the call if the alias is
found.
If the alias is not found locally, the VCS will then query its
7.
zones, in priority order, to see if any of them can find the
alias. If the alias matches an ENUM zone, this may return
a URI. If so, the process starts again; the URI is checked
against any Local Zone transforms, Administrator Policy and
User Policy.
If the alias is found by one of the neighbor zones, the call will
8.
be placed to that zone.
Call Processing Diagram
One of the functions of the VCS is to route calls to their
appropriate destination, based on the address or alias received
from a locally registered endpoint or neighbor zone.
There are a number of steps involved in determining the
destination of a call, and some of these steps can involve
transforming the alias or redirecting the call to other aliases. It
is important to understand the process before setting up your
dial plan so you can avoid circular references.
YES
NO
NO
NO
YES
YES
YES
NO
NO
VCS receives alias
(from locally
registered endpoint or
neighbour zone)
Does the alias
match a Local Zone
Transform pattern?
Apply Administrator
Policy
Has the alias been
amended?
Is User Policy enabled?
Is the alias a FindMe
name?
Search Local Zone
and Alternate
registrations
Has the alias been found?
Apply Local Zone
Transform
Is Administrator Policy
enabled?
NO
YES
Search Zones
(in order of priority)
Does the alias
match an ENUM zone
that has returned
a URI?
YES
Place call
NO
YES
Route call to new
alias(es) listed in the
FindMe configuration
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