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What is the difference between sending ACK for a transaction and Dialog.sendRequest(Request.ACK) ?

April 26, 2017ack difference transaction

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What is the difference between sending ACK for a transaction and Dialog.sendRequest(Request.ACK) ?

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The latter includes dialog state and places a fresh branch id in the Via. This ensures it will not match any transaction on the server. Use this when ACKing 2xx responses and the former when ACKing error directed towards a transction (3xx) and the like.