private void NatKeepAliveChannelMessageReceived(SIPChannel sipChannel, SIPEndPoint remoteEndPoint, byte[] buffer)
{
try
{
NATKeepAliveMessage keepAliveMessage = NATKeepAliveMessage.ParseNATKeepAliveMessage(buffer);
if (keepAliveMessage != null)
{
if (keepAliveMessage.LocalSIPEndPoint.Protocol == SIPProtocolsEnum.udp)
{
FireSIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.NATKeepAlive, SIPMonitorEventTypesEnum.NATKeepAliveRelay, "Relaying NAT keep-alive from proxy socket " + keepAliveMessage.LocalSIPEndPoint + " to " + keepAliveMessage.RemoteEndPoint + ".", null));
m_sipTransport.SendRaw(keepAliveMessage.LocalSIPEndPoint, new SIPEndPoint(keepAliveMessage.RemoteEndPoint), m_sendBuffer);
}
else
{
// For connection oriented protocols check whether a connection exists. NAT keep alives shouldn't cause a connection to be initiated.
SIPChannel sendFromChannel = m_sipTransport.FindSIPChannel(keepAliveMessage.LocalSIPEndPoint);
if (sendFromChannel != null && sendFromChannel.IsConnectionEstablished(keepAliveMessage.RemoteEndPoint))
{
FireSIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.NATKeepAlive, SIPMonitorEventTypesEnum.NATKeepAliveRelay, "Relaying NAT keep-alive from proxy socket " + keepAliveMessage.LocalSIPEndPoint + " to " + keepAliveMessage.RemoteEndPoint + ".", null));
m_sipTransport.SendRaw(keepAliveMessage.LocalSIPEndPoint, new SIPEndPoint(keepAliveMessage.RemoteEndPoint), m_sendBuffer);
}
else
{
FireSIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.NATKeepAlive, SIPMonitorEventTypesEnum.NATKeepAliveRelay, "No established connection was found to relay NAT keep-alive from proxy socket " + keepAliveMessage.LocalSIPEndPoint + " to " + keepAliveMessage.RemoteEndPoint + ".", null));
}
}
}
}
catch (Exception excp)
{
logger.Error("Exception NatKeepAliveChannelMessageReceived. " + excp.Message);
}
}
