| 摘要 |
A method comprise associating a first user system with a first user and associating a second user system with a second user. The first user system is in communication with the second user system via a communication network, and the second user system comprising an electronic sensor having a known sensing area. A request transmitted from the first user system via the communication network is received at the second user system. The request is for initiating a communication session between the first user and the second user. When the second user other than provides a response to the request within a predetermined period of time, data is sensed within the known sensing area using the electronic sensor of the second user system. The sensed data is analyzed. When a result of the analyzing is indicative of the second user being available, a notification signal is transmitted from the second user system to the first user system, via the communication network.
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