...

    var connectionOptions = {
        urlServer: url,
        keepAlive: true
    };

    if (authToken) {
        connectionOptions.authToken = authToken;
    } else {
        connectionOptions.sipOptions = sipOptions;
    }

    Flashphoner.createSession(connectionOptions).on(SESSION_STATUS.ESTABLISHED, function(session, connection){
        ...
    });

re-INVITE support

Since build 5.2.1943 re-INVITE for outgoing SIP calls is supported. If a SIP PBX sends SDP in 200 OK response to SIP INVITE from WCS, the SDP will be applied to media codecs negotiation to pass media traffic between WCS and SIP PBX. No changes in WCS settings required.

Known issues

1. It's impossible to make a SIP call if 'SIP Login' and 'SIP Authentification name' fields are incorrect

...