[SIPForum-discussion] Why three way handshake for INVITE?

[sachin garg]

Hi,

I was curious to know that why SIP (RFC3261) mandates a 3 way handshake for
INVITE *only*.
The extract (RFC 3261 section 17.1) says "

The long delays expected for

   sending a response argue for a three-way handshake"


I can understand about the need of session parameters negotiation but what
is the rationale behind the delay?

regards
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