Is REFER within dialog part of INVITE or subscription usage? (was RE: SIP INFO)

Brett Tate <[email protected]>
Newsgroups gmane.ietf.sip
Message-ID <9B2A061A1137254BBE4F4B2CD843646A10BFF48DF0@mbx02.citservers.local>
> If the REFER is within an existing dialog that has an INVITE 
> dialog usage, it is still (IIUC) technically not within the 
> invite dialog usage. So it shouldn't be used for negotiating 
> INFO packages.

Paul: Thanks for raising the issues.

Everyone: Is REFER within dialog part of INVITE usage, SUBSCRIPTION usage, or neither?

I'm asking mainly because of REFER 481 impacts; however the answer also has potential implications concerning draft-ietf-sip-info-events.  RFC 5057 appears to imply that it is part of the subscription usage; however I'm not positive if my interpretation and/or RFC 5057 is correct.

If REFER isn't considered part of the INVITE usage, how should REFER 481 be interpreted?  More specifically, should receiver of REFER 481 send BYE?

Thanks,
Brett

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