http://bugzilla.gnome.org/show_bug.cgi?id=576376 describes a feature request for Empathy - a "no-VoIP" mode in which the VoIP capabilities are not advertised. We can implement this by adding an Account.Interface.UnwantedChannelClasses.UnwantedChannelClasses (or something) which can be configured by UIs and respected by the ChannelDispatcher. The exact details have not been settled.
Chandni revisited this on Bug #53818, and I've done some more brainstorming on that bug. The more I think about it, the more I like the idea of a list of forbidden Handlers: a Handler is a convenient, user-facing thing to show in UIs, it's already extensible, and applications that want to have several orthogonal features which can be enabled/disabled independently can just be more than one Handler (by using more than one TpBaseClient).
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