[MMUSIC] rfc5888: Multigroup management

[Santiago Carot Nemesio <[e-mail]>]

Hi.

First of all, let me know if this list is the right place to deal with
this kind of questions, if this is not, please I would really
appreciate if you could address me to the right place.

I'm facing a problem regarding on how to identify groups when dealing
with negotiation which several groups might be involved in, specially
when groups involved have the same semantic.

Suposse there is an offer with next groups attributes:
...
a=group:LS 1 2 3
a=group:LS 1 2
...

Suppose that the other peer only supports medias identified by the
mids 1 and 2. Next would be the answer:
...
a=group:LS 1 2
a=group:LS 1 2
..

so attribute order is not mandatory and there is not way to identify
groups, how can the offerer know which group was offered with medias
1, 2 and 3, note that the answerer could have changed the order of the
attributes in the answer making this discrimination almost impossible.

Am I missing somthing, RFC58888 only warns you about that there may be
several a=groups lines in a session description, but not specifies how
to deal with this. Does attribute order matter for groups, if not how
can above situation be managed?

Regards.