/// <summary>
        /// Stops the DTMF singalling.
        /// </summary>
        internal void StopDtmfSignal(DtmfNamedEvents signal)
        {
            MediaHandlers.StopDtmf(signal);

            if (SelectedCall == null)
            {
                return;
            }

            SelectedCall.StopDTMFSignal(signal);
        }
        /// <summary>
        /// This will be called when the other party stopped DTMF signaling.
        /// </summary>
        private void Call_DtmfReceived(object sender, VoIPEventArgs <DtmfInfo> e)
        {
            DtmfSignal signal = e.Item.Signal;

            MediaHandlers.StopDtmf(signal.Signal);
        }