> > But definitely A can't initiate BYE before
> > a final response for INVITE been received.
> 
> Actually it can.  During simultaneous ringing
> situations, the originator can send
> a BYE to release individual early dialogs
> while allowing the other early dialogs to
> continue.
> [ABN] Why do you really need to have deviation 
> for this particular scenario? You can use 
> CANCEL instead of BYE to cancel the early dialog.

You can't use a CANCEL to release early-dialog-1
while allowing early-dialog-2 for the associated 
INVITE to still continue.  The CANCEL would trigger 
the release of both of the early dialogs.  The BYE
for early-dialog-1 releases early-dialog-1 without
releasing early-dialog-2.

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