Currently we implement an older version of the Jingle signalling, and an older version of GTalk's variant of it. Since we implemented that, both the spec has changed, GTalk was updated to the new spec, and the spec has changed again, so we have to update our code to work with the new versions of the protocol. Currently GTalk PC client has backwards-compatibility support so we can interoperate with them, but to ensure future interoperability we should have to update our code. This is also needed for proper Hold implementation, which requires Jingle features that the old version we implemented doesn't have. A prerequisite for all of this is to refactor the Jingle state machine. Vaguely assigned to Senko.
Fixed in release 0.7.16 with the merge of the big jingle branch.
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