Method and device for connecting packet-oriented communication terminals

A method for connecting packet-oriented communication terminals, the terminals comprising a first terminal within a first network and a second terminal within a second network, the second network connected to the first network via a network address-translating unit, the method comprising:

• controlling transmission from the first communication terminal to the second network via a gateway, a proxy being assigned to the gateway, the first communication terminal being registered with the gateway;
• the proxy intercepting or receiving a first signaling message sent from the first communication terminal that identifies the second communication terminal as a destination for the first signaling message to establish a communication connection with the second communication terminal;
• the proxy saving content of the first signaling message, the content of the first signaling message comprising a first private address and a first private port of the first communication terminal by which the first communication terminal intends to exchange communication information;
• the proxy querying a server of the second network using the first private address and the first private port of the first communication terminal obtained via the intercepted first signaling message;
• the proxy intercepting or receiving at least one query response message from the server of the second network responding to the querying of the proxy;
• the proxy extracting a first public address and a first public port number of the first communication terminal from the at least one query response message;
• the proxy creating a second signaling message based on the first signaling message, the second signaling message comprising the first public address and first public port to replace the first private address and the first private port of the first signaling message;
• the proxy sending the second signaling message to the second communication terminal such the communication connection is creatable between the first communication terminal and the second communication terminal.