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Call Server Configuration
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See also:
Preliminary/Postliminary Scripting
Sample Preliminary and Postliminary Scripts
Sample Preliminary and Postliminary Scripts
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.
The following sample scripts address many of the scenarios for which you might need a preliminary or
postliminary script. You can use them as templates or starting points for your scripts.
// Example preliminary and postliminary scripts
///////////////////////////////
// STRIP PREFIX
// If the dial string has prefix 99, remove it
// 991234 --> 1234
DIAL_STRING = DIAL_STRING.replace(/^99/,"");
///////////////////////////////
// ADD PREFIX
// Add prefix 99 to the dial string
// 1234 --> 991234
DIAL_STRING = "99" + DIAL_STRING;
///////////////////////////////
// STRIP PREFIX (SIP)
// If the dial string is a SIP URI with prefix 99 in the user part, remove it
// SIP:991234@abc.com --> sip:1234@abc.com
DIAL_STRING = DIAL_STRING.replace(/^sip:99([^@]*@)/i,"sip:$1");
///////////////////////////////
// ADD PREFIX (SIP)