We've had quite a few cases lately of clients missing channels, or the CM not advertising the right capabilities, because clients' filters weren't the right shape. In particular, for StreamedMedia you need three filters, and a bunch of tokens from MediaSignalling, but the documentation for this is split and hidden away in the InitialAudio property definition and in the video/h264 token definition. Each channel type should have a section in its introduction for common shapes of filters you might want to use.
I made a start for StreamedMedia; see the "Handler filters" section in <http://people.freedesktop.org/~wjt/telepathy-spec-channel_type_filters/spec/org.freedesktop.Telepathy.Channel.Type.StreamedMedia.html#description>.
Yes. I want to do a spec release shortly, so I'll incorporate this.
Branch merged, will be in 0.19.2. The bug remains open and unassigned, for all the other channel types.
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