SIPSorcery.SIP.SIPTransport.SendSIPReliable C# (CSharp) Method

        public void SendSIPReliable(SIPTransaction sipTransaction)
        {
            if (sipTransaction.RemoteEndPoint != null && sipTransaction.RemoteEndPoint.Address.Equals(BlackholeAddress))
            {
                sipTransaction.Retransmits = 1;
                sipTransaction.InitialTransmit = DateTime.Now;
                sipTransaction.LastTransmit = DateTime.Now;
                sipTransaction.DeliveryPending = false;
                return;
            }

            if (m_sipChannels.Count == 0)
            {
                throw new ApplicationException("No channels are configured in the SIP transport layer. The request could not be sent.");
            }
            else if (m_reliableTransmissions.Count >= MAX_RELIABLETRANSMISSIONS_COUNT)
            {
                throw new ApplicationException("Cannot send reliable SIP message as the reliable transmissions queue is full.");
            }

            //logger.Debug("SendSIPReliable transaction URI " + sipTransaction.TransactionRequest.URI.ToString() + ".");

            if (sipTransaction.TransactionType == SIPTransactionTypesEnum.Invite &&
                sipTransaction.TransactionState == SIPTransactionStatesEnum.Completed)
            {
                // This is an INVITE transaction that wants to send a reliable response.
                if (sipTransaction.LocalSIPEndPoint == null)
                {
                    throw new ApplicationException("The SIPTransport layer cannot send a reliable SIP response because the send from socket has not been set for the transaction.");
                }
                else
                {
                    SIPViaHeader topViaHeader = sipTransaction.TransactionFinalResponse.Header.Vias.TopViaHeader;
                    SendResponse(sipTransaction.TransactionFinalResponse);
                }
            }
            else
            {
                if (sipTransaction.OutboundProxy != null)
                {
                    SendRequest(sipTransaction.OutboundProxy, sipTransaction.TransactionRequest);
                }
                else if (sipTransaction.RemoteEndPoint != null)
                {
                    SendRequest(sipTransaction.RemoteEndPoint, sipTransaction.TransactionRequest);
                }
                else
                {
                    SendRequest(sipTransaction.TransactionRequest);
                }
            }

            sipTransaction.Retransmits = 1;
            sipTransaction.InitialTransmit = DateTime.Now;
            sipTransaction.LastTransmit = DateTime.Now;
            sipTransaction.DeliveryPending = true;

            if (!m_reliableTransmissions.ContainsKey(sipTransaction.TransactionId))
            {
                lock (m_reliableTransmissions)
                {
                    m_reliableTransmissions.Add(sipTransaction.TransactionId, sipTransaction);
                }
            }

            if (!m_reliablesThreadRunning)
            {
                StartReliableTransmissionsThread();
            }
        }