108
D14049.03
MAY 2008
Grey Headline
(continued)
TANDBERG
VIDEO COMMUNICATIONS SERVER
ADMINISTRATOR GUIDE
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 find 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 specified
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 first.
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 specified 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:
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 the zone that match the specified pattern
will then be transformed and the zone will be queried using the
new alias.
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 transform
gives some
•
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
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.
•
