US 7,606,351 B2 · Telephone number change notification method and telephone number change notification system

Abstract

A telephone number change notification method is provided in which a calling party is reliably identified when a new telephone number of a called party is notified to the calling party when the called party changed the telephone number. When a telephone exchange detects that a called number is changed based on a subscriber information database, the telephone exchange sends a prompt message asking for sending a telephone number notification request to a calling telephone. The calling telephone creates a digital signature and sends it to the telephone exchange. The telephone exchange forwards it to a new telephone number of a called telephone. The called telephone receives the digital signature and verifies it. If the digital signature is valid, the called telephone notifies a new telephone number to the calling telephone.

Claims20

Dependent claims

A telephone number change notification method in a communication system comprising a first telephone, a second telephone, and a telephone exchange, the telephone exchange carrying out connection between the first telephone and the second telephone based on a telephone number called by the first telephone, the method comprising the steps of:

determining, by the telephone exchange, whether the telephone number called by the first telephone has been changed;
sending, by the telephone exchange, a prompt message asking for a telephone number notification request with a digital signature to the first telephone if the telephone number has been changed;
forwarding, by the telephone exchange, a telephone number notification request with the digital signature sent from the first telephone in response to the prompt message to the second telephone having changed a telephone number;
determining, by the second telephone, whether the digital signature in the forwarded telephone number notification request with the digital signature is valid or not;
and
notifying, by the second telephone, the first telephone of the new changed telephone number if the digital signature is valid.

3 more elements

determining, by the telephone exchange, whether the telephone number called by the first telephone has been changed;
sending, by the telephone exchange, a prompt message asking for a telephone number notification request with a digital signature to the first telephone if the telephone number has been changed;
determining, by the telephone exchange, whether the digital signature in a telephone number notification request with the digital signature sent from the first telephone in response to the prompt message is valid or not;
and
notifying, by the telephone exchange, the first telephone of a new changed telephone number if the digital signature is valid.

2 more elements

A telephone number change notification system in a telecommunications system, comprising:

a first telephone;
a second telephone;
and
a telephone exchange for carrying out connection between the first telephone and the second telephone based on a telephone number called by the first telephone;
wherein the telephone exchange comprises:
a subscriber information database for storing subscriber information including old and new telephone numbers of a telephone;
and
digital signature requesting means for determining whether the telephone number called by the first telephone has been changed and sending a prompt message asking for a telephone number notification request with a digital signature to the first telephone if the digital signature requesting means determines that the telephone number has been changed based on the subscriber information database.

5 more elements

Dependencies are inferred from the claim text.

Telephone number change notification method and telephone number change notification system

Life of this patent

Telephone number change notification method and telephone number change notification system

Life of this patent

Abstract

Claims20