In a speech-path controlling method and device for a speech-path switch of a switching network, for establishing a speech-path between an input port connected to a subscriber's line and an output port connected to a trunk, an output re-circling line is provided connecting a specific output port to the...http://www.google.fr/patents/US6088597?utm_source=gb-gplus-shareBrevet US6088597 - Device and method for controlling speech-path
