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For out calling, one can use IP PBX to combine PSTN line and ITSP service. ITSP is Voice over IP service. For internal service, one uses Access Point to connect to WP520 (Wireless IP phone). Integrating IP PBX and Wireless phone, it gets rid of the wire. It is more moveable and convenient for mobile users. No more broadcast and no more phones lost. Its regular usage is same as to that of traditional PBX and IPBX. No need to study the new phone system again. And it can use wired IP phone, and the looks of the wired IP phone is similar to traditional phone.
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