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TANDBERG Gatekeeper User Guide
Page 26 of 105
5. Transforming Destination Aliases
5.1. Alias Transforms
The Alias Transforms function takes any aliases present in ARQ and LRQ messages and runs a set of
transformations on them. The resulting aliases will then be used in the normal Gatekeeper logic, exactly
as if those aliases were unchanged. Alias transforms will be applied prior to possible CPL modification
and Zone transforms. The Alias transforms will not have any effect on aliases presented in GRQ or RRQ
messages.
Alias transform rules are created either:
using the xconfiguration Gatekeeper Transform commands, or
using the web interface via Gatekeeper Configuration > Transforms and selecting Add New
Transform.
Alias transforms support the use of Regular Expressions. See Appendix C for further information.
Example
We have two gateways registered with the Gatekeeper with prefixes of 7 and 8 respectively.
We want to allow the users to dial 9 for an “outside line”, but use GW1 for local calls, and GW2 for
international calls. We should allow an alias manipulation that takes a destination alias of 90047… and
replaces it with 80047… and an alias of 90118… with 70118…. This is achieved by configuring alias
transforms as shown in Figure 7:
Figure 7: Example configuration of alias transforms