About Pre-Search Transforms; Configuring Pre-Search Transforms - Cisco TelePresence Administrator's Manual

About pre-search transforms

The pre-search transform function allows you to modify the alias in an incoming search request. The
transformation is applied by the VCS before any Call Policy or User Policy is applied, and before any
searches take place.
It applies to all incoming search requests received from locally registered endpoints, neighbor, traversal
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client and traversal server zones, and endpoints on the public internet.
It does not apply to requests received from peers (which are configured identically and therefore will have
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already applied the same transform).
Each pre-search transform defines a string against which an alias is compared, and the changes to make to
the alias if it matches that string.
After the alias has been transformed, it remains changed and all further call processing is applied to the new
alias.
Pre-search transforms are not applied to GRQ or RRQ messages received from endpoints registering with
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the VCS; endpoints will be registered with the aliases as presented in these messages.
All peers in a cluster should be configured identically, including any pre-search transforms. A VCS in a
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cluster treats search requests from any of its peers as having come from its own Local Zone, and does not
re-apply any pre-search transforms on receipt of the request.
Pre-search transform process
Up to 100 pre-search transforms can be configured. Each transform must have a unique priority number
between 1 and 65534.
Every incoming alias is compared with each transform in order of priority, starting with that closest to 1. If and
when a match is made, the transform is applied to the alias and no further pre-search checks and
transformations of the new alias will take place. The new alias is then used for the remainder of the
routing process.
Further transforms of the alias may take place during the remainder of the search process. This may be as
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a result of Call Policy (also known as Administrator Policy) or User Policy (if
the case, the pre-search transforms are re-applied to the new alias.
If you add a new pre-search transform that has the same priority as an existing transform, all transforms
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with a lower priority (those with a larger numerical value) will have their priority incremented by one, and the
new transform will be added with the specified priority. However, if there are not enough "slots" left to move
all the priorities down, you will get an error message.

Configuring pre-search transforms

The Transforms page (VCS configuration > Dial plan >
currently configured on the VCS. It is used to create, edit, delete, enable and disable transforms.
Aliases are compared against each transform in order of Priority, until a transform is found where the alias
matches the Pattern in the manner specified by the pattern Type. The alias is then transformed according to
the Behavior and Replace rules.
Cisco VCS Administrator Guide (X7.1)
Dial plan and call processing
FindMe
Transforms) lists all the
call
is enabled). If this is
pre-search transforms
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