Disclosed is a communication terminal apparatus for use in a communication system in which at least one line having a plurality of channels is used by a plurality of communication apparatuses (4, 5, 6, 7, 8, 9, 10), wherein when all the information channels are engaged, the idle condition thereof is...http://www.google.fr/patents/US5142525?utm_source=gb-gplus-shareBrevet US5142525 - Communication terminal apparatus
