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D14049.03
MAY 2008
Grey Headline (continued)
TANDBERG VIDEO COMMUNICATIONS SERVER
ADMINISTRATOR GUIDE
Introduction Getting Started
Overview and
Status
System
Conguration
VCS
Conguration
Zones and
Neighbors
Call
Processing
Bandwidth
Control
Firewall
Traversal
Maintenance Appendices
Searches and Transforms
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 nd all those 1.
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 2. Priority that has been
assigned to them.
If there are any duplicates in the list, the entry with the lower 3.
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 4. 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 5.
AlwaysMatch matches, the query will use the original alias; for
PatternMatch matches the query will use the alias specied
by the transform rules.
If the alias is found, the call will be forwarded to that zone. 6.
If the alias is found by more than one zone, the call will be
forwarded to the zone that responded rst.
If the alias is not found, all zones with a Priority 2 match are 7.
queried as per steps 5 and 6.
The process is repeated until either:8.
the alias is found, or
•
all zones with a match that meets the specied criteria
•
have been queried.
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:
congure 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 the zone that match the specied pattern
will then be transformed and the zone will be queried using the
new alias.
About Zone Searching
The VCS allows you to lter 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 ltering
search requests to zones. Each zone has up to ve congurable
“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
•
congure zone searches and transforms
gives some
•
examples of how zone searches and transforms
could be used together.
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
lter 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 specied 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 rst, followed by all zones with
Priority 2 matches, and so on.
Each zone has up to ve congurable matches. This
means that you can specify up to ve different
transforms for each zone. This could be:
one alias transformed ve different ways
•
ve aliases each transformed individually
•
a combination of both.
•