Users may sometimes be overloaded with work so that they become temporally unable to handle incoming communications. Context aware systems are a promising approach to facilitate daily-life activities, especially providing assistance for communication management. After having surveyed the different challenges to build context-aware systems (e.g. modeling, reasoning about context), we introduce here HEP, a system that recommends communication services to the caller based on the callee's context. The recommendation is in form of advertising the workload of callee. HEP's main context source is the usage history of the different communication services as well as the users' calendars. It has been prototyped and tested at Orange Labs.