[Sip] Why do we need 3-way handshake for INVITE transaction....

["Nataraju A.B." <natarajuab@huawei.com>]

Hello All,

I have a doubt why do we really need 3-way handshaking for INVITE
transacation.
whereas most of the others employ 2-way handshaking (BYE/200,
UPDATE/200...).

According to my knowledge one of the reason could be offer-answer mechanism
involved in INVITE transactions.

Thanx in advance,

Regards,
-Nataraju A.B.
 Huawei Technologies Ind Pvt Ltd,
 Bangalore-560008,
 +98455.95744

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