An intelligent auto call-transfer service based on location-awareness through wireless sensor network for the traditional phone system

The Public Switched Telephone Network (PSTN) is the oldest and largest telecommunications network in existence. The auto call-transfer function is one of the basic services supported by PSTN that switches incoming calls to the subscriber. It is likely for the subscribers to lose incoming calls when they leave the room. Therefore, we propose a ZigBee location-awareness and tag identification technique for the traditional phone system. Our technique identifies a person's location as he/she moves around the office building. Whenever there is an incoming call, the call will be transferred to the office phone nearest the person. As a result, the overall service quality would be enhanced to practical effect.