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| Number | Title | Issue Date |
| 7570756 | Method for supporting session mobility A method for supporting session mobility, more particularly, a method for supporting session mobility that can move various sessions between two or more devices by using session initiation protocol (SIP). Various sessions can be simultaneously moved by utilizing a S... | 08/04/2009 |
| 6978313 | Method and system for transporting generic data messages over the public switched telephone network to customer premises equipment without establishing a call Methods and systems are disclosed for transferring service application data from a server to a subscriber device via the PSTN without establishing a call between the server and subscriber device and without the PSTN switching components having inherent knowledge as ... | 12/20/2005 |
| 4320258 | Arrangement for requesting service for called telephone subscribers An improved ringing control circuit in a stored program telephone switching system which provides a called subscriber an interval or window of time after answering a call to send a request for special services such as identification of the number of the c... | 03/16/1982 |
| 4258231 | Remote line switching extension for telephone exchange There is described a remote switching terminal which functions as a concentrator switching stage for a central office switching system, such as a standard No. 5 crossbar switch. The remote station connects subscriber phones directly into the horizontal li... | 03/24/1981 |
| 4110566 | Switching network control arrangement A thyristor switching network is disclosed in which the switching network control provides both crosspoint audit and centralized control capabilities. The switching network control circuit contains three signal generators each of which generates a particu... | 08/29/1978 |
| 4079206 | Switching arrangement for a telephone system for connecting a calling subscriber set to an idle connector set upon recognizing a loop in the connector set A switching arrangement for a telephone system, wherein a subscriber circuit is connected over crosspoints of corresponding switching matrix stages to a junctor circuit feeding said subscriber circuit and receiving the signals thereof, wherein a common li... | 03/14/1978 |
| 3992592 | Scanner-marker arrangement for telephone system A scanner arrangement for scanning both line circuits and incoming trunk circuits simultaneously in groups with priority being given to the scanning of incoming trunk circuits. A sequencing means provides for individual scanning of line circuits of respec... | 11/16/1976 |
