Re:
> Clearly, an ACK is needed before the UAC can issue a BYE.
Small clarification, the ACK isn't necessarily required BEFORE the BYE, it
is just required to complete the initial Invite transaction, to stop
retransmits of the final response to the Invite. The ACK is part of the
Invite transaction, the BYE is a separate transaction. It should not be
necesary for the first transaction to complete before issuing another
request such as BYE or Cancel.
John Hearty
Level 3 Communications, Inc.
-----Original Message-----
From: Vijay Gurbani [mailto:[EMAIL PROTECTED]]
Sent: Friday, June 08, 2001 10:53 AM
To: Ranjit Avasarala
Cc: Gautham A N; [EMAIL PROTECTED]
Subject: Re: [Sip-implementors] doubt in BYE and ACK
Ranjit Avasarala wrote:
>
> Hi Vijay
>
> I am not talking of ACK after INVITE, ya ACK is mandatory after u
> receive INVITE, but after that say either of the UAs wish to
> terminate the call, they can send a BYE.
Ranjit:
My apologies if I misunderstand your reply, which is paraphrased below:
> Ranjit Avasarala wrote:
> >
> > Hi
> >
> > basically BYE can be sent whenever the caller or callee wishes to
> > terminate the call. So ya you can send BYE instead of sending an ACK for
> > a final response like 200 OK.
Note: "send BYE instead of sending an ACK for a final response". This is
^^^^^^^^^^^^^^^^^^^^^^^^^
what I was pointing out as being in error. You MUST send an ACK. The ori-
ginal poster wanted to know (I believe) if it was okay to send a BYE to a
call leg a UAC does not want to maintain, or if an ACK was needed before
the BYE. Clearly, an ACK is needed before the UAC can issue a BYE.
Regards,
- vijay
--
Vijay K. Gurbani vkg@{lucent.com,research.bell-labs.com,acm.org}
Internet Software and eServices Group
Lucent Technologies/Bell Labs Innovations 263 Shuman Blvd., Rm 1A-413
Naperville, Illinois 60566 Voice: +1 630 224 0216 Fax: +1 630 713 0184
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