This question may have the answer you are looking for.
I removed the parts that probably don't matter to you and left the part that really captures IPAddress.
public ServerProcessing ProcessMessage(IServerChannelSinkStack sinkStack, IMessage requestmessage, ITransportHeaders requestHeaders, System.IO.Stream requestStream, out IMessage responseMessage, out ITransportHeaders responseHeaders, out System.IO.Stream responseStream) {
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