How to do routing using javascript

To configure a script for Javascript routing you have to list it in the javascript.conf file.
The Javascript module has support for programmatically routing a call step by step.
Using the example bellow you will learn how to:

• route calls starting with specific blocks of numbers
• route calls to a specific gateway set in accfile module.

Configure script in Javascript module

To configure a script for Javascript routing it must be listed in the javascript.conf file:

[general]
routing=example.js

Configure a gateway

The example.js for outside routing requires to configure accfile.conf:

[gwout]
enabled=yes
protocol=sip
username=outcalls
password=mypass
registrar=a.b.c.d

Routing Script

Write example.js in /usr/src/yate/share/scripts where Yate scripts are (or where you have Yate sources).

// First display calling and called party numbers
Engine.output("Got call from '" + message.caller + "' to '" + message.called + "'");

if (message.called.substr(0,2)=="19") {
        // route calls starting with 19 to 192.168.168.1
        // 5060 is the default SIP port. When using the default port you don't need to specify it
        Channel.callJust("sip/sip:" + message.called + "@192.168.168.1:5060");
} else if (message.called.substr(0,2)=="00" && message.called.length>10) {
        //route calls using a function 
        routeOutside();
} else if (message.called.match("^60")) {
        //route calls starting with 60 to 192.168.168.1
        Channel.callJust("h323/"+message.called+"@192.168.168.1:1720");
} else if (message.caller=="209") {
        //route calls from caller: 209
        Channel.callJust("iax/user_iax@192.168.168.1:4569/"+message.called+"@iaxcontext");
} else {
        //route other calls that don't match the above rules 
        Channel.callJust("wave/play//var/spool/sounds/hello.au");
}

function routeOutside() {
    // rewrite caller number for all calls that will be routed to this account
    message.caller = "+40211231234";
    // rewrite called number: strip 00 and add +_in front of the number
    message.called = "+" + message.called.substr(2);
    // send all calls starting with +40 to line "gwout" defined in accfile.conf
    message.line = "gwout";
    Channel.callJust("line/"+message.called);
}

How it works

When a call is coming in a new instance of the already parsed routing script is created and associated with the inbound call leg.
The main code flow (that is, outside any function) is then executed after setting the call.route message parameters in the message variable. The Javascript code can make decisions based on these parameters and can call methods of the Channel object to route the call to the desired destination.

DB Example

This example uses JS to retrieve information from DB

// Get DB Object 
var m = new Message("database");
// Specify connection to use
m.account = "yateadmin";
// Define Query
m.query = "SELECT * FROM lines WHERE location IS NOT NULL ORDER BY line LIMIT 5";
// Run the Query
if (m.dispatch()) {
    if (m.rows > 0) {
        Engine.output("Got " + m.rows + " records of " + m.columns + " fields");
        Engine.output("result[0,0] = " + m.getResult(0,0));
        var res = m.getColumn("location");
        for (var i = 0; i < res.length; i++) {
            Engine.output("location[" + i + "] = " + res[i]);
        }
    }
}
else {
    Engine.output("Query failed");
}

See also

• Javascript routing module

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