Switching system for providing an improved call waiting service
First Claim
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1. A switching system which interconnects a first telephone, a second telephone and a third telephone through circuit switching, comprising:
- an interrupt notification unit which enables the first telephone, when a dial tone is being sent to the first telephone prior to dialing of a phone number of the second telephone, to notify its user of an incoming call from the third telephone; and
an interrupt call control unit which enables a connection between the first telephone and the third telephone to be established when a predetermined number for accepting the incoming call is dialed on the first telephone after the notification of the incoming call.
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Abstract
A switching system includes an interrupt notification unit which enables a first telephone, when a dial tone is being sent to the first telephone prior to dialing of a phone number of a second telephone, to notify its user of an incoming call from a third telephone. An interrupt call control unit enables a connection between the first telephone and the third telephone to be established when a predetermined number for accepting the incoming call is dialed on the first telephone after the notification of the incoming call.
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Citations
14 Claims
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1. A switching system which interconnects a first telephone, a second telephone and a third telephone through circuit switching, comprising:
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an interrupt notification unit which enables the first telephone, when a dial tone is being sent to the first telephone prior to dialing of a phone number of the second telephone, to notify its user of an incoming call from the third telephone; and
an interrupt call control unit which enables a connection between the first telephone and the third telephone to be established when a predetermined number for accepting the incoming call is dialed on the first telephone after the notification of the incoming call. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A switching system which interconnects a first telephone, a second telephone and a third telephone through circuit switching, comprising:
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an interrupt notification unit which enables the first telephone, when a phone number of the second telephone is being dialed on the first telephone, to notify its user, at an end of the dialing, of an incoming call from the third telephone; and
an interrupt call control unit which enables a connection between the first telephone and the third telephone to be established when the first telephone is placed in an on-hook condition after the notification of the incoming call. - View Dependent Claims (8, 9)
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10. A switching system which interconnects a first telephone, a second telephone and a third telephone through circuit switching, comprising:
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an interrupt notification unit which enables the first telephone, when a ring-back tone is being sent to the first telephone after a phone number of the second telephone is dialed on the first telephone, to notify its user of an incoming call from the third telephone; and
an interrupt call control unit which enables a connection between the first telephone and the third telephone to be established when the first telephone is placed in an on-hook condition after the notification of the incoming call. - View Dependent Claims (11, 12)
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13. A switching system which interconnects a first telephone, a second telephone and a third telephone through circuit switching, comprising:
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an interrupt detection unit which detects an incoming call from the third telephone to the first telephone when a ringing tone is being sent to the first telephone while a ring-back tone is being sent to the second telephone after a phone number of the first telephone is dialed on the second telephone; and
an interrupt notification unit which enables the first telephone, which is active in a communication with the second telephone by placing the first telephone into an off-hook condition in response to the ringing tone, to notify its user, at a start of the communication, of the incoming call from the third telephone. - View Dependent Claims (14)
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Specification