ObserveChannels() is meant to take a ChannelDispatchOperation parameter, but MC does not implement this version.
We should skip straight past the current spec and implement the one from Bug #20908.
Implemented in my observer-20909 branch, commit ba751fc3a, with an additional patch in my break-api branch to actually make it active.
Implementation: http://git.collabora.co.uk/?p=user/smcv/telepathy-mission-control-smcv.git;a=shortlog;h=refs/heads/observer-20909-break-api I believe the part up to observer-20909 can safely be merged right now.
All approved by mardy, merge to follow as part of a coordinated API break.
Was fixed in 5.0.beta68
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