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:[email protected]]
Sent: Thursday, April 16, 2009 6:56 PM
To: Shamik Saha (WT01 - Telecom Equipment)
Cc: [email protected]
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: [email protected] [mailto:sip-
> [email protected]] On Behalf Of
> [email protected]
> Sent: Thursday, April 16, 2009 9:12 AM
> To: [email protected]
> Cc: [email protected]
> 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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