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- Subscribes to presence update signals for that have been added. - Update events can be subscribed to via the presence service. - A contact's last known presence status can be queried via the presence service. Change-Id: I4e1ed87f980978469b267c34936da25d15cef7eb Reviewed-by: Kateryna Kostiuk <kateryna.kostiuk@savoirfairelinux.com>
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