13. Call Policy; About Call Policy; Uploading The Cpl Script; Enabling Use Of The Cpl Script - TANDBERG Gatekeeper User Manual

13. Call Policy

13.1.

About Call Policy

Your TANDBERG Gatekeeper allows you to set up policy to control which calls are allowed and even
redirect selected calls to different destinations. You specify this policy by uploading a script written in the
Call Processing Language (CPL). Each time a call is made the Gatekeeper executes the script to decide,
based on the source and destination of the call, whether to

Proxy the call to its original destination

Redirect the call to a different destination

Reject the call.
The Gatekeeper will only execute scripts for source or destinations which are registered directly with the
system.
13.1.1.
To upload the CPL script, go to
the file in the
Note: The CPL script cannot be uploaded via the command line interface.
13.1.2.
To enable or disable use of the CPL script, either:
issue the command:
xConfiguration Gatekeeper Policy Mode <On/Off>
or go to Gatekeeper Configuration
policy box.
13.1.3.
Policy interacts with authentication (see section 8.2). If authentication is enabled on the local
Gatekeeper and a call is received from a remote, unauthenticated Gatekeeper, the call's source aliases
will be removed from the call request before it is passed to the policy engine. This is because the
unauthenticated source aliases could be forged and so should not be used for policy decisions in a
secure environment.
13.1.4.
The following sections give details of the Gatekeeper's implementation of the CPL language and should
be read in conjunction with the CPL standard (RFC 3880 [5]).

Uploading the CPL script

Gatekeeper Configuration
CPL file field.

Enabling use of the CPL script

-> Gatekeeper

Call Policy and Authentication

CPL Standard

TANDBERG Gatekeeper User Guide
-> Files. In the Policy
and in the Configuration section, tick or clear the
section, enter the path of
CPL
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