A three-way call detection and response system comprising, in accordance with a preferred embodiment, a three-way call detector coupled non-intrusively, by a bridge repeater, to a communication path carrying digital signals between originator and recipient end office telecommunication switches. The three-way...http://www.google.fr/patents/US5883945?utm_source=gb-gplus-shareBrevet US5883945 - Three-way call detection and response system
