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DE19504078A1
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Method for initiating remote maintenance of a private branch exchange
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DE4447183A1
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Extendable telecommunications switching system
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DE4443286A1
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Differential amplifier circuit
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DE4443119A1
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Method for a telecommunications, in particular a telephone exchange with night stations
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DE4435325A1
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Procedure for maintaining the system time data in the event of a power failure in communication switching systems
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DE4433936A1
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Disconnecting plug for protecting subscriber lines from excess voltage
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DE4425624A1
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Potential rise accelerating circuit for logic bus line
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DE4422597A1
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Digitally controlled communication terminal appts. circuitry
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DE4418979A1
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Procedure for adapting message formats
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DE4416592A1
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Analogue telephone equipment arrangement for connection to personal computer
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DE4411739A1
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Establishing external connections for telephone PBX
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DE4408086A1
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Method for recognizing spelled names or terms for communication switching systems
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DE4402981A1
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Housing arrangement for a telecommunications exchange
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DE4401518A1
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Method for operating an automatic ordering system in communication switching systems
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DE4343543A1
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Method for automatically controlling answering machine functions in switching systems
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DE4342739A1
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Miniature telecommunications exchange installation
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DE4342740A1
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Small telecommunication exchange system metal housing
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DE4340332A1
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Isolating plug for overvoltage protection of connecting lines (leads, cables)
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DE4340330A1
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Digital data transmission scrambler circuitry
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DE4329056A1
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Method for operating a digital communication network consisting of several subsystems
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