Communication System and Communication Method
First Claim
1. A communication system comprising:
- a local area communication network system constructed in a predetermined area;
an outside communication network system where an IP wireless phone is available;
a radio terminal apparatus that carries out, when receiving a notice on a transmission switchover request for requesting switchover from extension phone transmission to cellular phone transmission after carrying out extension phone transmission to a call destination in said predetermined area, switchover of transmission to said call destination from extension phone transmission to cellular phone transmission;
a circuit switching apparatus that connects said local area communication network system and said outside communication network system and notices, if said call destination is absent in said predetermined area when said extension phone transmission is received, said transmission switchover request to said radio terminal apparatus; and
a cellular network system where said radio terminal apparatus that has switched over to said cellular phone transmission carries out a direct voice communication with said call destination outside said predetermined area without the medium of said circuit switching apparatus.
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Accused Products
Abstract
A wireless terminal in which the probability that an incoming call is accepted is greatly improved and the load on the circuit switch is lightened. Each of such wireless terminals (120) comprises a wireless LAN interface (126), a cellular wireless interface (127), and a telephone number table (1241) storing an extension number and a cellular number both associated with each other. Each of the wireless terminals (120) searches the telephone number table (1241) on receiving a call switch request from the circuit switch (111), identifies the cellular number concerning the call switch request, and automatically switches the call for the wireless terminal corresponding to the cellular number to a cellular telephone call.
14 Citations
11 Claims
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1. A communication system comprising:
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a local area communication network system constructed in a predetermined area;
an outside communication network system where an IP wireless phone is available;
a radio terminal apparatus that carries out, when receiving a notice on a transmission switchover request for requesting switchover from extension phone transmission to cellular phone transmission after carrying out extension phone transmission to a call destination in said predetermined area, switchover of transmission to said call destination from extension phone transmission to cellular phone transmission;
a circuit switching apparatus that connects said local area communication network system and said outside communication network system and notices, if said call destination is absent in said predetermined area when said extension phone transmission is received, said transmission switchover request to said radio terminal apparatus; and
a cellular network system where said radio terminal apparatus that has switched over to said cellular phone transmission carries out a direct voice communication with said call destination outside said predetermined area without the medium of said circuit switching apparatus. - View Dependent Claims (2, 3, 4, 5)
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6. A communication system comprising:
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a home communication network system constructed in each of plural subscribers'"'"' homes;
an outside communication network system where an IP wireless phone is available;
a radio terminal apparatus that carries out IP phone transmission to a call destination in said subscriber'"'"'s home and then switches, when receiving a notice on a transmission switchover request for requesting switchover from IP phone transmission to cellular phone transmission, from IP phone transmission to cellular phone transmission to said call destination;
a circuit switching apparatus that is installed in a service provider station, connects said home communication network system and said outside communication network system and notices, if said call destination is absent in said subscriber'"'"'s home when said IP phone transmission is received, said transmission switchover request to said radio terminal apparatus; and
a cellular network system where said radio terminal apparatus that has switched over to said cellular phone transmission carries out a direct voice communication with said call destination outside said subscriber'"'"'s home without the medium of said circuit switching apparatus. - View Dependent Claims (7, 8, 9)
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10. A communication method whereby a local area communication network system constructed in a predetermined area and an outside communication network system are connected by a circuit switching apparatus in said predetermined area and a radio communication apparatus in said predetermined area communicates with a call destination, comprising:
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a step by said radio communication apparatus of carrying out extension phone transmission to said call destination;
a step by said circuit switching apparatus of checking, when receiving said extension phone transmission, whether said call destination is present or absent in said predetermined area;
a step by said circuit switching apparatus of noticing, when said call destination is absent in said predetermined area, a transmission switchover request for requesting said radio terminal apparatus to switch from extension phone transmission to cellular phone transmission;
a step by said radio communication apparatus of switching, when receiving the notice of said transmission switchover request, transmission to said call destination from extension phone transmission to cellular phone transmission; and
a step by said radio terminal apparatus that has switched over to said cellular phone transmission of carrying out a direct voice communication with said call destination in a cellular network system without the medium of said circuit switching apparatus.
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11. A communication method whereby a home communication network system constructed in each of plural subscribers'"'"' homes and an outside communication network system are connected by a circuit switching apparatus installed in a service provider station and a radio communication apparatus in said subscriber'"'"'s home communicates with a call destination, comprising:
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a step by said radio communication apparatus of carrying out IP phone transmission to said call destination;
a step by said circuit switching apparatus of checking, when receiving said IP phone transmission, whether said call destination is present or absent in said subscriber'"'"'s home;
a step by said circuit switching apparatus of noticing, when said call destination is absent in said subscriber'"'"'s home, a transmission switchover request for requesting said radio terminal apparatus to switch from IP phone transmission to cellular phone transmission;
a step by said radio communication apparatus of switching, when receiving the notice of said transmission switchover request, transmission to said call destination from IP phone transmission to cellular phone transmission; and
a step by said radio terminal apparatus that has switched over to said cellular phone transmission of carrying out a direct voice communication with said call destination in a cellular network system without the medium of said circuit switching apparatus.
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Specification