Here's one I don't know the answer to off the top of my head:
Right now, we can offer the same SDP we've offered before (not
changing the o line). This is used, for instance, with session-timer
when we want to use
a re-INVITE but don't really want to change the session.
However, the specs allow the answer to such a non-changed offer to be
different from the previous answer.
What was the motivation? There were a few attendees at SIPit 21
arguing that implementation would be simpler for them if this answer
had to be a copy of the previous answer as well. Did we allow it to
change just because we could? Or is there an application I'm not
remembering that really needs this flexibility? If not, would we be
willing to add this restriction?
RjS
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