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"RoboCop watching you" IM dedicated code has been inserted into Call::setState() and it's an Open Close Principle violation. Move it into a dedicated function and assign it to call state change as listener. As code changed, also make a better state listening implementation that do not depend on listener call order. Notice: TODO have been inserted, it's for another patch. Change-Id: Ibe37555320de1dec173338a62323320d3d93bb4a Reviewed-by: Andreas Traczyk <andreas.traczyk@savoirfairelinux.com>
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