Maemo 5 uses various extended interfaces beyond what's in telepathy-spec, including those in: http://git.collabora.co.uk/?p=telepathy-mission-control.git;a=tree;f=xml;hb=master One of those is Account.Interface.Stats, used to count active "channels" of a particular o.f.T.Channel.ChannelType. What's actually counted is the number of Channels of that type, plus the number of ChannelRequests that are expected to yield Channels of that type. As far as I know, this is used on Maemo 5 to have UIs prompt the user before going offline if there are "significant" channels active. "Significant" seems likely to be defined as "Text or StreamedMedia".
Deleted in 2011.
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