Notice that BYE is part of INVITE usages; it is not part of SUBSCRIBE usages.
"4.1. Invite Usages
Created by: non-100 provisional responses to INVITE; 200 response to
INVITE
Destroyed by: 200 responses to BYE; certain failure responses to
INVITE, UPDATE, PRACK, INFO, or BYE; anything that destroys a
dialog and all its usages
4.2. Subscribe usages
Created by: 200 class responses to SUBSCRIBE; 200 class responses to
REFER; NOTIFY requests
Destroyed by: 200 class responses to NOTIFY-terminated; NOTIFY or
refresh-SUBSCRIBE request timeout; certain failure responses to
NOTIFY or SUBSCRIBE; expiration without refresh if network issues
prevent the terminal NOTIFY from arriving; anything that destroys
a dialog and all its usages"
> -----Original Message-----
> From: shamik.s...@wipro.com [mailto:shamik.s...@wipro.com]
> Sent: Thursday, April 16, 2009 9:45 AM
> To: Brett Tate; attila.si...@vegastream.com
> Cc: sip-implementors@lists.cs.columbia.edu
> Subject: RE: [Sip-implementors] BYE after SUBSCRIBE?
>
> Hi Brett,
>
> In section 4 it is said that
>
> " Dialogs come into existence along with their first usage. Dialogs
> terminate when their last usage is destroyed. The messages that
> create and destroy usages vary per usage. This section provides a
> high-level categorization of those messages. The section does not
> attempt to explore the REGISTER pseudo-dialog."
>
> So since the invite transaction creates this dialog so this will be the
> first and the founding usage of this dialogue.
>
> When we send the subscription request and gets back the 200OK the
> subscribe usage is created which is the second usage within the initial
> invite dialogue.
>
>
>
> So when we get a 481 in response to a BYE it will only terminate the
> usage associated with that BYE transaction.
> Which in our case will be the subscription usage.
>
>
> However if the INVITE usage is destroyed after the esatblishment of the
> subscription usage then the subscription usage will be the last usage
> and its termination will terminate the dialog.
>
>
> Otherwise,the initial INVITE transaction will be unaffected.
>
> It is said that 481 terminate the usage
>
> "Destroys Usage The error destroys the usage, but not the dialog.
> Any other usages sharing this dialog are not affected."
>
> So I think since INVITE usage is the dialog creating usage,which is not
> related to the BYE message it will be un-affected.
>
> Please let me know if my thoughts are wrong.
>
>
>
> Thanks and regards,
>
> Shamik Saha
> Project Engineer
> Voice Protocols
> Cell : +91-9886704155
>
> -----Original Message-----
> From: Brett Tate [mailto:br...@broadsoft.com]
> Sent: Thursday, April 16, 2009 6:56 PM
> To: Shamik Saha (WT01 - Telecom Equipment)
> Cc: sip-implementors@lists.cs.columbia.edu
> Subject: RE: [Sip-implementors] BYE after SUBSCRIBE?
>
> Shamik,
>
> Please reread section 4 concerning the distinction between INVITE usage
> and SUBSCRIBE usage.
>
> Per tables 1 and 2, BYE 481 applies to the INVITE usage.
>
> -brett
>
> > -----Original Message-----
> > From: sip-implementors-boun...@lists.cs.columbia.edu [mailto:sip-
> > implementors-boun...@lists.cs.columbia.edu] On Behalf Of
> > shamik.s...@wipro.com
> > Sent: Thursday, April 16, 2009 9:12 AM
> > To: attila.si...@vegastream.com
> > Cc: sip-implementors@lists.cs.columbia.edu
> > Subject: Re: [Sip-implementors] BYE after SUBSCRIBE?
> >
> > But in RFC 5057 page 9,it is said that a 481 will terminate the
> > SUBSCRIPTION usage but the INVITE usage dialogue within which the
> > subscription is established will be un-affected.
>
>
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