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Preliminary and Postliminary Scripting

A preliminary is an executable script, written in the Javascript language, that defines processing actions (filtering or transformation) to be applied to a dial string before the dial rule’s action is performed.

A postliminary is an executable script, written in the Javascript language, that defines dial string transformations to be applied before querying an external device (gatekeeper, SIP peer, SBC, or MCU).

Transformation scripts output some modification of the DIAL_STRING variable (which is initially set to the dial string being evaluated).

Filtering scripts may pass the dial string on to the dial rule’s action (if the filter criteria aren’t met) or return one of the following:

NEXT_RULE: Skips the rule being processed and passes the dial string to the next rule.

BLOCK: Rejects the call.

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