Greetings,
I'm trying to understand (or arrive at) the consensus
concerning early
media offer/answer within sip when no answer SDP or
"preview" answer SDP
is included within the 18x response. And since there was
little
activity on the related sipping and sip-implementors
threads, I thought
that I'd try the sip working group and the authors of some
of the
relevant RFCs.
When not using early-session (rfc3959), is it appropriate to
send early
media to offerer without bothering to send an answer SDP or
"preview"
answer SDP within the 18x? (By "preview", I mean
not sent reliably.)
There are of course limitations in not sending the SDP.
Some of the
limitations are reflected in rfc3264, rfc3959, rfc3960, and
the
following posting. The following posting also presents
potential
reasons why some vendors might have chosen to act this way.
http://www1.ietf.org/mail-archive/web/sipping
/current/msg12640.html
I think that part of my confusion stems from early versions
of the early
media drafts indicating things like 18x with sendonly SDP
being sent
followed by a 200 with sendrecv SDP. However after their
incorporation
into rfc3261, rfc3262, and rfc3264, I'm uncertain if an SDP
needs to be
sent within the 18x. Based upon rfc3666, the answer does
not need to be
sent reliably before acting as answerer. However if not
sent reliably,
does rfc3264 section 6.1 still apply? And if so, does
rfc3264 section
6.1 still apply even when 18x sent without bothering to
include the SDP
(the SDP might eventually be sent within an INVITE 200
response)?
Thanks in advance for a response,
Brett
P.S. Sorry about posting my question on yet another email
list.
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