Patent ID: 6229820
Filing Date: 2001-05-08
Classification: H04L

Abstract:
A network system comprising:a first node accommodating a first terminal equipment;a second node accommodating a second terminal equipment; anda third node accommodating a third terminal equipment, wherein:said first node receives from said first terminal equipment a call setting request for requesting a first connection and a second connection to be set between said first terminal equipment and said second terminal equipment;said first node transmits to said second node a connection request message for requesting said first and second connections to be set between said first terminal equipment and said second terminal equipment;said second node, when receiving the connection request message, judges whether or not said first and second connections can be set between said second node and said second terminal equipment, and if, between said second node and said second terminal equipment, either one of said first and second connections can be set but other connection of said first and second connections cannot be set, said second node only sets the one connection between said second node and said second terminal equipment;said second node transmits to said third node a substitute connection setting message for setting the other connection between said first terminal equipment and third terminal equipment;said second node sets the one connection between said second node and said first node;said third node receives the substitute connection setting message and sets the other connection between said third node and said third terminal equipment according to the substitute connection setting message;the other connection is set between said third node and said first node; andsaid first node sets said first and second connections between said first node and said first terminal equipment.