METHOD FOR ESTABLISHING A CALL, SIGNALING CONTROLLER, NETWORK ELEMENT AND SYSTEM

摘要

The present invention proposes a method for establishing a call, a signaling controller for controlling a network element to allow a terminal to access to a packet network, a network element for allowing a terminal to access to a packet network and a communication system including at least two terminals, network elements and a media gateway controller, wherein at least a first terminal and a second terminal are connected respectively via at least a first network element and a second network element to a first network which is in turn connected to a second network via a third network element that is address translation enabled, said first network and second network are packet networks, said method for establishing a call between said first terminal and said second terminal comprising: creating context for the call with translated addresses of said first network element and said second network element in said second network; determining if said first network element and said second network element in the context for the call are corresponding to the same translated address in said second network; and establishing a traffic connection for the call with respective addresses of said first network element and second network element in said first network if the addresses of said first network element and second network element in the context for the call are corresponding to the same translated address in said second network.