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D 14049.01
07.2007
76
TANDBERG VIDEO COMMUNICATION SERVER
ADMINISTRATOR GUIDE
Text goes here
Introduction
Getting
Started
System
Overview
System
Configuration
H.323 & SIP
Configuration
Registration
Control
Zones and
Neighbors
Call
Processing
Firewall
Traversal
Bandwidth
Control
Maintenance
Appendices
TANDBERG
ADMINISTRATOR GUIDE
TANDBERG VIDEO COMMUNICATION SERVER
ADMINISTRATOR GUIDE
Call
Processing
Alias Searching and Transforming
Zone Search and Transform Process
Zones are queried when an alias has not been found locally.
The search and transform process is as follows:
The VCS looks at all matches for all zones to find all those
with either:
a Mode of AlwaysMatch, or
a Mode of PatternMatch and a Pattern String that
matches the alias being searched for.
These matches are listed in order of the Priority that has
been assigned to them.
If there are any duplicates in the list, the entry with the
lower Priority is removed. (This applies to a zone with the
same pattern string and the same transform but different
priorities.)
If there is a zone which has an AlwaysMatch as well as
a PatternMatch with no transforms, the PatternMatch is
removed from the list.
All zones with a Priority 1 match on the list are queried.
For AlwaysMatch matches, the query will use the original
alias; for PatternMatch matches the query will use the alias
specified by the transform rules.
If the alias is found, the call will be forwarded to that zone.
If the alias is found by more than one zone, the call will be
forwarded to the zone that responded first.
If the alias is not found, all zones with a Priority 2 match are
queried as per steps 5 and 6.
The process is repeated until either:
the alias is found, or
all zones with a match that meets the specified criteria
have been queried.
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Zone Searching and Transforming
About Zone Transforms
The VCS allows you to change the alias being searched for
before a search request is sent out to a particular zone. This
feature uses the PatternMatch mode of the zone search
function.
To set up a zone transform, you must:
configure the zone with a Mode of PatternMatch
specify the pattern that the alias to be transformed must
match
specify the way in which the alias will be transformed.
All searches sent to that zone that match the specified pattern
will then be transformed and the zone will be queried using the
new alias.
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About Zone Searching
The VCS allows you to filter the search requests sent to each
zone, and prioritize the order in which zones are searched. This
allows you to reduce the potential number of search requests
sent out, and speed up the search process.
The VCS uses the concept of zone “matches” when filtering
search requests to zones. Each zone has up to five
configurable “matches” available to it. Each match is assigned
a Mode and Priority (described below). The combination of the
two determines if and when that zone will be queried.
Using Zone Searches and Transforms Together
The zone searching feature and the zone transforms feature
both make use of the PatternMatch mode. You can use these
two features together or separately.
The remainder of this section:
describes the zone search and transform process
explains how to configure zone searches and transforms
gives some examples of how zone searches and transforms
could be used together.
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It is possible for the same priority to be given to more
than one match, either in the same zone or in different
zones. In this case, all zones with that match priority
will be queried at the same time.
Mode
The match Mode allows you to specify whether and how you will
filter requests to the zone. Alternatively, you can use this mode
to prevent search requests from ever being sent to the zone.
The Mode options are:
AlwaysMatch: always query the zone
PatternMatch: only query the zone if the alias being searched
for matches a specified pattern
Disabled: never query the zone (this mode does not need a
corresponding Priority option).
Priority
The match Priority allows you to specify when in the search
process that zone will be queried. Search requests are sent to
all zones with a Priority 1 match first, followed by all zones with
Priority 2 matches, and so on.
Each zone has up to five configurable matches. This
means that you can specify up to five different
transforms for each zone. This could be:
one alias transformed five different ways
five aliases each transformed individually
a combination of both.
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