TANDBERG Security Camera manual Call Processing Diagram

Grey Headline (continued)

Introduction

TANDBERG VIDEO COMMUNICATIONS SERVER ADMINISTRATOR GUIDE

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.

Search Process

The process followed by the VCS when attempting to locate a destination endpoint is shown in the diagram opposite.

1.	The user enters into their endpoint the alias or address of the
	destination endpoint. This can be in a number of different
	formats.
2.	The destination address is sent from the caller’s endpoint to
	its local VCS (i.e. the VCS to which it is registered).
3.	The VCS applies any Local Zone transforms to the alias.
4.	The VCS applies any Administrator Policy to the (transformed)
	alias. If this results in a new alias, the process starts
	again, with the new alias checked against the Local Zone
	transforms.
5.	The VCS applies any User Policy to the alias. If the alias is a
	FindMe name, the process will start again; all the resulting

VCS receives alias (from locally registered endpoint or neighbour zone)

						YES
Does the alias
				Apply Local Zone
match a Local Zone			YES
				Transform
Transform pattern?
	NO
Is Administrator Policy				Apply Administrator
			YES
enabled?					Policy
	NO
					NO
				Is the alias a FindMe
Is User Policy enabled?		YES					YES
					name?

NO

YES

Has the alias been

amended?

Route call to new

alias(es) listed in the FindMe configuration

	aliases will be checked against Local Zone transforms and
	Administrator Policy.
6.	The VCS then checks all its local registrations and those
	of its Alternates for the alias, placing the call if the alias is
	found.
7.	If the alias is not found locally, the VCS will then query its
	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.
8.	If the alias is found by one of the neighbor zones, the call will
	be placed to that zone.

Search Local Zone
and Alternate	NO
registrations

		Search Zones
Has the alias been found?	NO
		(in order of priority)

YES

Place call

Does the alias

match an ENUM zone that has returned a URI?

Introduction	Getting Started	Overview and	System	VCS	Zones and	Call	Bandwidth	Firewall	Maintenance	Appendices
		Status	Configuration	Configuration	Neighbors	Processing	Control	Traversal
D14049.03					92
MAY 2008