Back to results
US 5,491,744 AGranted
Selective call waiting
AssigneeConsilium Overseas Limited
InventorDan Kikinis
Life of this patent
Estimating the term…
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.
Claims8
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.
4 more elements
A selective call-waiting system comprising;
- 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.
4 more elements
Dependencies are inferred from the claim text.