| 摘要 |
A method of monitoring a call with a mobile terminal (MT) (11) in an Internet Protocol (IP)-based network (10) having a Gatekeeper (17) that controls the network, a plurality of access routers (12, 14) that provide access to the network, and a Monitoring Station (18) having monitoring facilities and a database of MTs to be monitored. When the MT sends an Admission Request message (21) to the Gatekeeper, the Gatekeeper sends a query (23) to the Monitoring Station asking whether the MT is to be monitored. The Monitoring Station sends a reply (25) to the Gatekeeper indicating that the MT is to be monitored and providing an IP address where monitored packets are to be sent. The Gatekeeper then sends a monitoring request message (28) to the access router (12) associated with the MT. The request identifies the MT to be monitored, instructs the access router to monitor the MT, and provides a unique call identification (Call ID) and the IP address where monitored packets are to be sent. When the access router detects a packet associated with the MT, the router sends all packets associated with the MT to the Monitoring Station. The method also controls monitoring during intra-domain and inter-domain handoffs of the MT. |
