An interface,5, wherein the means for locating an idle switched port include means for differentiating between ports set for incoming and outgoing switched calls through the gateway, and between remote procedure calls requesting {HEAD ~ incoming and outgoing switched calls} through {TAIL ~ the gateway} 
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An interface,5 , wherein the means for locating an idle switched port include means for differentiating between ports set for incoming and outgoing switched calls through the gateway , and between remote procedure calls requesting { HEAD ~ incoming and outgoing switched calls } through { TAIL ~ the gateway }
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