Are there any normative documents regarding the following situation:
1. The session is succesfully established between UA A and UA B.
2. Both UAs are UI-constrained hardware devices, and very similar to traditional hardware phones.
3. Users of A and B "simultaneously" (within those 100ms that are introduced by network delay) set their party on hold.
Thus, from the point of view of processing SDP Offer/Answer, they both can use their copies of offers as corresponding answers (except, may be, fixing version numbers in "o"). But what from the point of view of the UI? Which one is then given the ability to take the party off hold?
Thanks in advance, Kirill
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