The VCS does not currently support some elements that are
described in the CPL RFC. If an attempt is made to upload a
script containing any of the following elements an error message
will be generated and the VCS will continue to use its existing
policy.
The following elements are not currently supported:

time-switch

•

string-switch

•

language-switch

•

priority-switch

•

redirect

•

mail

•

log

•

subaction

•

lookup

•

remove-location

•

As the CPL script is evaluated it maintains a list of addresses (H.323 IDs, URLs and E.164 numbers) which will be used as the
destination of the call if a

proxy

node is executed. The

location

node allows the location set to be modified so that calls can be

redirected to different destinations.
At the start of script execution the location set is initialized to empty for incoming calls and to the original destination for outgoing
calls.
The following attributes are supported on

location

nodes. It supports the use of Regular Expressions (see the

Regular Expression

Reference

for further information).

Clear = "yes" | "no"

Specifies whether to clear the current location set before adding
the new location. The default is to append this location to the
end of the set.

url=string

The new location to be added to the location set. The given
string can specify a URL (e.g.

[email protected]

), H.323 ID or an

E.164 number.

priority=<0.0..1.0> | "random"

Specified either as a floating point number in the range

0.0

1.0

, or

random

, which assigns a random number within the

same range.

1.0

is the highest priority. Locations with the

same priority are searched in parallel.

regex="" replace=""

Specifies the way in which a location matching the regular
expression is to be changed.

location

On executing a

proxy

node the VCS will attempt to forward the

call to the locations specified in the current location set. If
multiple entries are in the location set then this results in a
forked call. If the current location set is empty the call will be
forwarded to its original destination.

proxy

reject

If a

reject

node is executed the VCS stops any further script

processing and rejects the current call. The custom reject
strings

status=string

and

reason=string

options are

supported here.

rule-switch

This extension to CPL is provided to simplify administrator policy scripts that need to make decisions based on both the source and
destination of the call. A

rule-switch

may contain any number of rules that are tested in sequence; as soon as a match is found the

CPL within that rule element is executed. Each rule must take one of the following forms:

The meaning of the various origin selectors is as described in the

Field

section.

Unsupported CPL Elements