mCheckConnectTimer = new System.Windows.Forms.Timer();
            mCheckConnectTimer.Interval = Settings.Default.CheckConnectTimer * 1000 * 60;//N分钟检测
            mCheckConnectTimer.Tick += new EventHandler(mCheckConnectTimer_Tick);
            mCheckConnectTimer.Enabled = true;
 void mCheckConnectTimer_Tick(object sender, EventArgs e)
        {

            ConfigData cfgData = ReadConfigFile();
            string strIP = cfgData.Sip_Proxy_Name;
            Ping pingSender = new Ping();
            PingOptions pingOption = new PingOptions();
            pingOption.DontFragment = true;
            int timeout = 2000;//超时时间为2秒
            PingReply reply = pingSender.Send(strIP, timeout);
            if (reply.Status == IPStatus.Success)
            {
                //MessageBox.Show("能ping通 ");
                if (this.mPttRegSuccess == false)
                {

}
            }
            else
            {
                //MessageBox.Show("ping不通");
                if (this.mPttRegSuccess)
                {

                }
    
            }
        }