This open issue occurs when an INVITE sent to the AOR is forked by the
proxy and multiple UAs in the group answer (send 200 OKs). At this
point, there are multiple distinct (not necessarily mixed) dialogs
associated with the same appearance number, which breaks a key
requirement of this feature.
In normal cases, this is just a transient condition, where the caller
will send BYEs to all but one of the answering UAs. At this point, we
are back to a one-to-one relationship between distinct dialogs and
appearance numbers.
However, if the caller does not do this and keeps multiple, independent
dialogs ongoing, this is a problem. Few UAs do this, although some do,
so we need to have a solution for this.
A proposed solution is for the Appearance Agent to mark these dialogs as
"logically" joined (the UAs can not do this since they may not know
another 200 OK was sent). To make sure that join/take do not produce
unpredictable results, both dialogs could be marked exclusive which
would prevent join/take operations.
Feedback on this would be very useful.
Thanks,
Alan
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