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

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

vishal,

does ur 2nd point mean that the SIP application  might select one of the 'n'
replies to the INVITE request (if it was not intenede for multi-party call).
even in this case it is logical to derive that application will selecet the
first response and reject the later 2xx responses OR will the application
wait for some time before sending the ACK back to callee.

Regards,
-Nataraju A.B.
----- Original Message -----
From: "Vishal Phirke" <vishal_phirke@nmss.com>
To: "Nataraju A.B." <natarajuab@huawei.com>
Cc: <sip@ietf.org>; <sip-admin@ietf.org>
Sent: Saturday, May 31, 2003 12:33 AM
Subject: Re: [Sip] Why do we need 3-way handshake for INVITE transaction....


>
> Apart from offer-answer mechanism, INVITE transactions differ from other
> transactions in following ways:
> 1. They take more time and often an user intervention is required.
> 2. Invites can be forked. And if multiple destinations send 200 OK, you
> don't want to end up with multiple connections. Instead, 3-way handshake
> allows the decision of accepting one of them delayed till Ack is sent by
> the originator of the request.
> Hence, it is very important to do reliable handshake at the time of
session
> establishment.
> -Vishal
>
>
>
>                       "Nataraju A.B."
>                       <natarajuab@huawe        To:       sip@ietf.org
>                       i.com>                   cc:
>                       Sent by:                 Subject:  [Sip] Why do we
need 3-way handshake for INVITE
>                       sip-admin@ietf.or         transaction....
>                       g
>
>
>                       05/30/2003 02:04
>                       PM
>
>
>
>
>
>
> 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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> This list is for NEW development of the core SIP Protocol
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>
>
>
>
>

_______________________________________________
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Use sipping@ietf.org for new developments on the application of sip