Selective call waiting
First Claim
Patent Images
1. A method for operating a selective call-waiting service, comprising steps of:
- (a) receiving an incoming call and determining its destination;
(b) determining if destination line is in use;
(c) if destination line is not in use, routing the incoming call on the destination line;
(d) if destination line is in use, checking subscription information to determine if a subscriber on the destination line has selective call-waiting service;
(e) if the subscriber on the destination line has the selective call-waiting service, checking destination line for voice-type or data-type transmission;
(f) if data-type transmission, sending a busy signal to the incoming caller, and no call-waiting signal to the destination line;
(g) if voice-type transmission, sending a call-waiting signal to the destination line.
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Accused Products
Abstract
A selective call-waiting system for telephony use samples transmission on a busy line if the line subscribes to the selective call-waiting service, and avoids interrupting the transmission with a call-waiting signal if the transmission is data-type. If the transmission on the busy line subscribing to the selective call-waiting service is voice-type, the system sends a call-waiting signal. Signal analyzers are disclosed, as well as methods for practicing the invention.
45 Citations
8 Claims
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1. A method for operating a selective call-waiting service, comprising steps of:
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(a) receiving an incoming call and determining its destination; (b) determining if destination line is in use; (c) if destination line is not in use, routing the incoming call on the destination line; (d) if destination line is in use, checking subscription information to determine if a subscriber on the destination line has selective call-waiting service; (e) if the subscriber on the destination line has the selective call-waiting service, checking destination line for voice-type or data-type transmission; (f) if data-type transmission, sending a busy signal to the incoming caller, and no call-waiting signal to the destination line; (g) if voice-type transmission, sending a call-waiting signal to the destination line. - View Dependent Claims (2, 3)
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4. A selective call-waiting system comprising;
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a CPU for managing operations of the selective call-waiting system; receiving circuitry for receiving an incoming call; a memory connected to the CPU and storing call-waiting subscriber'"'"'s telephone numbers; signal analyzing circuitry for determining whether transmission on a line in use is voice-type transmission or data-type transmission; and switching and signal-generation circuitry for routing incoming calls and sending pre-stored signals on the connected telephone line; wherein, on receipt of the incoming call for a destination number determined to be in use, the CPU checks the memory, determines if the destination number subscribes to selective call-waiting, if so checks the signal analyzing circuitry to determine whether the transmission on the line in use is voice-type or data-type, causes a call-waiting signal to be sent to the destination line if the transmission is voice-type, and causes no call-waiting signal to be sent if the transmission is data-type. - View Dependent Claims (5, 6, 7, 8)
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Specification