If UPDATE was integral to the INVITE usage, it would have been defined within 
RFC 3261.

> -----Original Message-----
> From: Bob Penfield [mailto:[email protected]]
> Sent: Wednesday, March 21, 2012 8:50 AM
> To: Brett Tate; Kashif Husain; [email protected]
> Subject: RE: [Sip-implementors] 405 response for UPDATE
> 
> Then does that mean the RFC 5057 is incorrect when it says:
> 
>    (3) 405 Method Not Allowed:
> 
>        501 Not Implemented:
> 
>       Either of these responses would be aberrant in our example
>       scenario since support for the NOTIFY method is required by the
>       usage.  In this case, the UA knows the condition is unrecoverable
>       and should stop sending NOTIFYs on the usage.  Any refresh
>       subscriptions should be rejected.  In general, these errors will
>       affect at most the usage.  If the request was not integral to the
>       usage (it used an unknown method, or was an INFO inside an INVITE
>       usage, for example), only the transaction will be affected.
> 
> Typically UPDATE is integral to the INVITE usage.
> 
> 
> cheers,
> (-:bob
> 
> 
> 
> 
> -----Original Message-----
> From: [email protected] [mailto:sip-
> [email protected]] On Behalf Of Brett Tate
> Sent: Wednesday, March 21, 2012 8:46 AM
> To: Kashif Husain; [email protected]
> Subject: Re: [Sip-implementors] 405 response for UPDATE
> 
> > Is this a valid behavior?
> > Is it allowed to send 405 in this scenario?
> 
> Yes; the behavior is valid.  Just because UPDATE was allowed, it
> doesn't mean that it must continue to be allowed.
> 
> However, the behavior that you are describing is more prevent with
> B2BUAs reconnecting dialogs that do and don't support UPDATE.
> 
> 
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