class SipCallManager implements CallManager, SpeechletService, SessionListener {

    @Override
    public void start() throws NoresourceError, IOException {
        LOGGER.info("startup MRCPv2 SIP CallManager");
        sessions = new java.util.HashMap<String, SipCallManagerSession>();
        ids = new java.util.HashMap<String, String>();
        sipServer.startup();
        started = true;
    }

}