To log in to RingCentral, get the Platform object and call its authorize method, providing valid username, extension, and password values. Enter your phone number in E.164 format for username. The + may be omitted.

A Promise is returned, and you can use its then method to specify your continuation function, and its catch method to specify an error handling function.

var platform = rcsdk.getPlatform();

platform.authorize({

    username: '+18001234567', // your phone number in E.164 format

    extension: '101', // leave blank if direct number is used

    password: 'yourpassword'

}).then(function(ajax) {

    // your code here

}).catch(function(e) {

    alert(e.message  || 'Server cannot authorize user');

});