Patent ID: 7836160

Claim:
A method of monitoring IP telephone calls routed over at least a portion of an IP network, the method comprising: maintaining, in a memory, a list of telephone numbers to be monitored; determining during registration of an IP telephony device if the IP telephony device corresponds to a telephone number to be monitored by determining if said list includes a telephone number corresponding to said IP telephony device; in response to determining that said IP telephony device corresponds to a telephone number to be monitored, obtaining information identifying the edge router through which said IP telephony device is coupled to the IP network; transmitting a monitor command with an IP address being used by said IP telephony device to the identified edge router; and operating the identified edge router to forward packets including the IP address transmitted with said monitor command to a monitoring station, by operating the identified edge router to duplicate packets including the IP address transmitted with the monitor command and forwarding the duplicated packets to said monitoring station.