Patent ID: 8127005
Filing Date: 2012-02-28
Classification: H04L,H04M

Abstract:
1. A computer-implemented method for lawfully intercepting communication IP packets exchanged between a first terminal having a first IP address and a second terminal having a second IP address, the method comprising: first equipment in a data network of a first telecommunications service provider transmitting a third IP address to the first terminal for use in a SDP (Session Description Protocol) connection field of SIP (Session Initiation Protocol) messages to be transmitted by the first terminal to establish communication between the first terminal and the second terminal, the first equipment and/or a second equipment in the data network receiving from the first terminal encapsulated IP packets with an outer header containing the first IP address, a inner header containing the third IP address, and a destination address, the first equipment and/or the second equipment removing the outer header before sending the communication IP packets to the destination address; and intercepting the communication IP packets in the data network.