Telephone call dialling

Details Telephone call dialling Telephone call dialling

2008-04-15

2008-04-15

Hong, Harry S. (Department: 2614)

Telephonic communications

Plural exchange network or interconnection

With interexchange network routing

C379S221020, C379S221060, C379S221140

Reexamination Certificate

active

07359501

ABSTRACT:
A device for making telephone calls receives input data defining a call destination. The device generates a request message which is output to a control center, a response message then being received from the control center identifying a preferred route for routing the call to the call destination. The routing information is utilized by the device in initiating communication with the call destination. Typically the input data is a telephone number and the dialing means initiates communication using a modified telephone number which may include a prefix obtained from routing data contained in the response message. Response messages may be stored in a cache memory to reduce the need for request messages. The device may be a mobile telephone operating in a cellular telecommunications network or may be a landline device such as telephone or facsimile machine. Where the device is a mobile telephone, the response message may include additional information such as updating information for stored preferred network and barred network tables.

REFERENCES:
patent: 5515427 (1996-05-01), Carlsen et al.
patent: 5953657 (1999-09-01), Ghisler
patent: 0 693 859 (1996-01-01), None
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patent: 99 11050 (1999-03-01), None

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