[SIPForum-discussion] If TCP is used as transport then can we ignore sending of ACK?

[Abinash Sarangi]

Hi,
Whatever be the underlying transport protocol be it TCP/SCTP/RUDP(for reliable transport) or UDP (non-reliable), every sip client or server has to achieve a 3-way handshake at transaction layer (invite--1xx--2xx--ack) for offer-answer mechanism.(example delayed offer  we need ACK to carry SDP payload)3way handshake at transport layer for TCP ensures socket is established both way but can not ensure application payload is exchanged properly or not.

Thanks in advance,

-Abinash 


Date: Thu, 28 Jul 2011 16:24:57 +0530
From: nitisha.gupta06 at gmail.com
To: discussion at sipforum.org
Subject: [SIPForum-discussion] If TCP is used as transport then can we	ignore sending of ACK?

Hi 

Can anyone explain :

What is the use of ACK message in INVITE transaction? If TCP is used as transport then can we ignore sending of ACK?

Thanks
Nitisha


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