[Sip] INVITE transaction

[Vijaya Venkatachalam <vijaya@ulticom.com>]

Hi,

I have a question regarding the INVITE transaction
state machine.

It seems that in RFC 3261 - transaction state machine for
INVITE transactions, there is a potential for
the client side transaction to indefinitely be
in the "Proceeding" state since all timers
are cancelled on the reception of a 1xx response.

Can somebody tell me how the client side transaction
can come out of this state, if the server transaction on
the remote end dies?

Is it that the timer B is not cancelled and that only
timer A is cancelled when the 1xx is received or is
there some other means.

Appreciate a quick response.

Thanks,
Vijaya
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