Parameters of type boolean fail in Connection.check_parameters. This is because it is doing isinstance(instance of dbus.types.Boolean, bool) which fails beause dbus.types.Boolean does not subclass bool. A tested patch can be found in git://github.com/epage/telepathy-python.git
The branch also has outstanding changes for Bug 6059
Seems this got fixed in February by Olivier in commit 6e2c862fe2e0ff.
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