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Browse by Category: Main > Communications
Class Information
Number: 379/156
Name: Telephonic communications > Multi-line or key substation system with selective switching and central switching office connection
Description: Subject matter including circuitry for allowing a subscriber terminal to be selectively connected to one of a plurality of lines, at least one of which is a public telephone line.










Sub-classes under this class:

Class Number Class Name Patents
379/162 Detail of hold circuitry 86
379/166 Detail of line circuit or line card 81
379/164 Line status indication or call alerting 249
379/165 Switching or supervision feature (e.g., common control, digital) 266
379/161 With exclusion or priority feature (e.g., lockout or privacy) 77
379/159 With intercom system 120
379/157 With special service 225


Patents under this class:
1 2 3 4 5

Patent Number Title Of Patent Date Issued
8615563 Method for switching an access node Dec. 24, 2013
8565125 Services based two way voice service recording and logging Oct. 22, 2013
8494120 Detecting foreign voltage faults in telephone customer premise equipment Jul. 23, 2013
8457291 Universal target button Jun. 4, 2013
8457181 Rate agile rate-adaptive digital subscriber line Jun. 4, 2013
8364154 Employing multiple mobile devices with varying functional capabilities Jan. 29, 2013
8320894 Employing multiple mobile devices with varying functional capabilities Nov. 27, 2012
8290123 Gateway and method for detecting a communication link between a called telephone and a telephone switch Oct. 16, 2012
8249134 High impedance state for digital subscriber line transceivers on copper pairs Aug. 21, 2012
8223939 Method, communication terminal and communication system for displaying a name assigned to a telephone number when a connection is established Jul. 17, 2012
8189566 Software based trading turret May. 29, 2012
8184788 Communication system May. 22, 2012
8139729 Systems and methods for handling calls associated with an interactive voice response application Mar. 20, 2012
8081743 Server apparatus Dec. 20, 2011
8081747 System and method of managing telephone calls within a voice over internet protocol telephone system Dec. 20, 2011
8019067 User interface for telephone system administration Sep. 13, 2011
7826347 Call processing device and method Nov. 2, 2010
7756260 Method for providing features to the user of a telephone, a central unit and a telecommunication system therefor Jul. 13, 2010
7746995 Telephone control system Jun. 29, 2010
7746993 Ringing phone line selector/VOIP switch Jun. 29, 2010
7734301 Communication system Jun. 8, 2010
7729486 Private branch exchange and telephone switching system Jun. 1, 2010
7672438 Providing multiple line functionality using alternative network telephony Mar. 2, 2010
7643624 Remote line access for a multi-line residential telephone Jan. 5, 2010
7630726 Communication method operated by software and apparatus thereof Dec. 8, 2009
7616626 Telephone exchange apparatus and control method for telephone exchange apparatus Nov. 10, 2009
7606351 Telephone number change notification method and telephone number change notification system Oct. 20, 2009
7570631 Cable telephony network supporting roaming VoIP terminals Aug. 4, 2009
7567656 Telephone communication apparatus Jul. 28, 2009
7529540 Method and system for invoking push-to-service offerings May. 5, 2009
7496186 Outside-LAN connectable IP key telephone system, terminal unit thereof, main unit thereof, and outside-LAN connecting method Feb. 24, 2009
7421526 Reconfigurable virtual backplane architecture Sep. 2, 2008
7418265 System and method for interrupt control on a handheld device Aug. 26, 2008
7321586 Method for establishing communication links in an exchange in a switching system Jan. 22, 2008
7308086 Telephone communication apparatus Dec. 11, 2007
7301940 Dual-use packet/analog phone or phone-adapter in a packet telephony distribution system Nov. 27, 2007
7257211 Method and apparatus for controlling and/or monitoring a MULAP line Aug. 14, 2007
7200383 Subscriber authentication for unlicensed mobile access signaling Apr. 3, 2007
7194074 Key telephone system, key telephone, interface unit, and transmission scheme determination method Mar. 20, 2007
7190778 Communication system and keyset therefore capable of identifying selected user locations Mar. 13, 2007
7139375 Highway expansion apparatus for key telephone system and operation method thereof Nov. 21, 2006
7088807 Call pick-up system and method of a switching device Aug. 8, 2006
7050556 Key telephone unit and key telephone system May. 23, 2006
7013007 Computer telephony power supply method and apparatus Mar. 14, 2006
7010105 Format-converting device and private branch exchange system using the same, and format-converting method and memory medium storing a program to allow computer to execute the same method Mar. 7, 2006
7006614 Systems and methods for voice and data communications including hybrid key system/PBX functionality Feb. 28, 2006
7003081 Priority based methods and apparatus for transmitting accurate emergency location identification numbers (ELINs) from behind a multi-line telephone system (MLTS) Feb. 21, 2006
6980634 Telephone circuit controller apparatus Dec. 27, 2005
6978000 Key telephone system and interface unit for key telephone Dec. 20, 2005
6975713 Providing multiple line functionality using alternative network telephony Dec. 13, 2005

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