[SIPForum-discussion] Why ACK??

[Lee, Kao]

I assume you are talking about a TCP 3 way handshake when you refer to the SIP ocer TCP. That 3 way handshake establishes communication at the network transport layer and not at the SIP application layer. To establish a call, you will still need a SIP 3 way handshake at the application layer.

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From: discussion-bounces at sipforum.org <discussion-bounces at sipforum.org>
To: discussion at sipforum.org <discussion at sipforum.org>
Sent: Mon Feb 22 23:18:59 2010
Subject: [SIPForum-discussion] Why ACK??

Hi Every one...

    Can any one tell why a 3 way handshake is required for INVITE ???even though SIP can be tramitted over TCP



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