| http://www.w3.org/ns/prov#value | - A telecommunications system, which is an Integrated Service Digital Network (ISDN) comprising:a plurality of conferencing nodes (2-9) being arranged in two one-way conference rings with a pair of first and second channels (B1 B2), each of the plurality of nodes having a pair of adjacent nodes in the ring; the nodes including a speaking node for providing a speaking signal on a channel, and further
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