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D14049.05
February 2009
Grey Headline
(continued)
TANDBERG
VIDEO COMMUNICATIONS SERVER
ADMINISTRATOR GUIDE
Introduction
Getting started
Overview and
status
System
configuration
VCS
configuration
Zones and
neighbors
Call
processing
Bandwidth
control
Firewall
traversal
Appendices
Applications
Maintenance
Searches and transforms
About searches
One of the VCS’s functions is to process incoming requests to search for a particular alias. These
search requests are received from
locally registered endpoints
•
neighboring systems, including neighbors, traversal clients and traversal servers
•
endpoints on the public internet.
•
Regardless of the origin of the request, the VCS will search its Local Zone and all external zones for
the alias. When creating and configuring zones, you assign at least one match and corresponding
priority to each zone, and the zones with the highest priority matches (i.e. those with a priority
closest to
1
) are searched first. In addition, you can use these pattern matching rules to filter
searches to specific zones. For full information about configuring searches, see the
Zone searching
and transforming
section.
When searching for an alias, the VCS will first search all the highest-priority zone(s) using
the protocol of the incoming call. If the search was unsuccessful the VCS may then search
the same zone(s) again using the alternative protocol, depending on where the search came
from and the
Interworking mode
(
VCS configuration > Protocols > Interworking
). If that search was
unsuccessful, the VCS will then move on to the next highest priority zones, searching first in the
native protocol and then in the alternative protocol.
If the request has come from a neighboring system and
Interworking mode
is set to
RegisteredOnly
,
the VCS will search the local zone using both protocols, and all other zones using the native
protocol only (because it will interwork the call only if one of the endpoints is locally registered).
If
Interworking mode
is set to
On
, or the request has come from a locally registered endpoint, the
VCS will search the local zone and all external zones using both protocols.
About transforms
The VCS allows you to transform the alias in a search request if it matches certain criteria. This
transformation can be applied to the alias at two points in the search process:
as soon as it is received and before it is searched for locally (
•
pre-search transforms
)
after call policy has been applied and
•
before sending a search request to the Local Zone and
external zones
.
You can transform the alias by removing or replacing its prefix, suffix, or the entire string, and by
the use of regular expressions.
All peers in a cluster should be configured identically, including any pre-search transforms.
A VCS in a cluster will treat search requests from any of its peers as having come from its
own Local Zone, and will not re-apply any pre-search transforms on receipt of the request.
Overview of searches and transforms
