On May 31, 2007, at 4:19 AM, Nina Garaca wrote:
Hi all,
I have read rfc2976 - The SIP INFO Method, but I haven't really
understood that INFO message belongs only to INVITE dialog usage,
which however draft-ietf-sipping-dialogusage-04 claims in its part
5.3:
5.3. Matching requests to usages
For many mid-dialog requests, identifying the usage they belong
to is
obvious. A dialog can have at most one invite usage, so any INVITE,
UPDATE, PRACK, ACK, CANCEL, BYE, or INFO requests belong to it.
So my, question is:
Can INFO message belong to other usages, besides INVITE, such
are SUBSCRIBE or REFER?
There was IIRC no intent in the writing of RFC 2976 to restrict INFO
to occurring within an INVITE dialog usage. So it could technically
be used outside of one, including in non-dialog cases.
However, RFC 2976 is considered to be somewhat underspecified, and so
far the only place we've further specified its usage is in the
context of transporting binary data for telephony protocol tunelling.
We have a standing consensus to NOT use it for arbitrary data at this
time. If we were to start using it, we'd need to do something like
the event-packages model for INFO. So don't use it, and you won't
have to deal with this . . .
--
Dean
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