Hi,

I have a 3PCC that is attempting to reserve
a resource A in advance with the intention of
using it sometime later (seconds maybe) in a
session with an as yet unknown user B.

3PCC --> INVITE (no SDP) --> A   requires rel100, preconditions
3PCC <--   100 TRYING    <-- A
3PCC <-- 183 PROG (SDP1) <-- A   offers SDP1, requires rel100
3PCC -->   PRACK (SDP2)  --> A   is required to PRACK with answer -
inactive?
3PCC <--  200 OK (PRACK) <-- A   accepts SDP2

If SDP1 contains a media stream, is the 3PCC
required to answer with a media stream in SDP2?
Or could it answer with no media stream and
use an UPDATE request to indicate the
media stream later?

What is meant by the term "no media" as it
is used in the flows of the 3PCC draft?

TIA,
TIm
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