let Softphone = {
/**
 * Make a new call
 */
    call: function(number) {
        if (ua.sessionInstance)
            return;

        ua.sessionInstance = ua.call(`sip:${number}@${uriHost}`, options); 
    },

/**
 * Hang up current call
 */
    hangup: function() {
        if (!ua.sessionInstance)
            return;

        ua.sessionInstance.terminate();
    },

/**
 * Mute current call
 */
    mute: function() {
        if (!ua.sessionInstance)
            return

        ua.sessionInstance.mute();
    },

/**
 * Unmute current call
 */
    unmute: function() {
        if (!ua.sessionInstance)
            return

        ua.sessionInstance.unmute();
    },

/**
 * Get if current call is muted
 */
    isMuted: function() {
        if (!ua.sessionInstance)
            return

        return ua.sessionInstance.isMuted();
    },

/**
 * Hold current call
 */
    hold: function() {
        if (!ua.sessionInstance)
            return

        ua.sessionInstance.hold();
    },

/**
 * Unhold current call
 */
    unhold: function() {
        if (!ua.sessionInstance)
            return

        ua.sessionInstance.unhold();
    },

/**
 * Get if current call is on hold
 */
    isOnHold: function() {
        if (!ua.sessionInstance)
            return

        return ua.sessionInstance.isOnHold().local;
    },

/**
 * Transfer current call
 */
    transfer: function(number) {
        if (!ua.sessionInstance)
            return

        ua.sessionInstance.refer(`sip:${number}@${uriHost}`);
    },

/**
 * Get volume
 */
    getVolume: function() {
        return options.volume;
    },

    isMicEnabled: function() {
        if (options.microphone)
            return true;
    },

    getStatus: function() {
        
    },

    setStatus: function() {

    }
}