| 摘要 |
A telephone installation comprising a PABX (4) connected to the telephone network, extensions connected to the PABX by inside connections (6), and additional intercommunication devices connected between the PABX and privileged extensions (2). Said additional intercommunications devices comprise a processor module (8) associated with each privileged extension (2) and provided with a radio transmitter-receiver (16-18) and an antenna (20) for interchanging signalling between the privileged extensions (2), and each privileged extension includes at least one additional key which, when actuated, causes said module (8) to operate as follows: to detect ringing current sent by the PABX (4) to said privileged extension (2); and to respond to said detected ringing current by transmitting radio signalling requesting, automatically and with supervision, at least one other extension to intercept the call.
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