| 摘要 |
A communication system, an apparatus, and a method for providing a call state thereof are provided. The method for providing a call state of a communication system, supporting communication over a mobile communication network and an interne network, includes, when presence of mobile call execution changes through a base transceiver station over the mobile communication network, notifying the presence of mobile call execution to an Instant Messaging/Presence Service (IM/PS) server managing presence of interne call execution over the interne network by a User Equipment (UE), and sending the presence of mobile call execution to another UE by the IM/PS server.
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