/// <summary>
 ///
 /// </summary>
 /// <param name="connectionId"></param>
 /// <param name="sender"></param>
 public virtual void RemoveSender(string connectionId, IStreamSender sender)
 {
     sender.Track.Stop();
     sender.SetSender(connectionId, null);
     if (ExistConnection(connectionId))
     {
         RemoveTrack(connectionId, sender.Track);
     }
 }
        /// <summary>
        ///
        /// </summary>
        /// <param name="connectionId"></param>
        /// <param name="sender"></param>
        /// <returns></returns>
        public virtual void AddSender(string connectionId, IStreamSender sender)
        {
            var transceiver = m_handler.AddSenderTrack(connectionId, sender.Track);

            sender.SetSender(connectionId, transceiver.Sender);
        }