INTERCEPTION OF MULTIMEDIA SERVICES

摘要

The present invention relates to a method for monitoring in a telecommunication system. The system comprises a service domain that handles session control and a bearer domain used for transportation of media flow. A request for monitoring of a first party (A) is received by a Call Session Control Function (CSCF) in the service domain. The method comprises the following further steps: - A SIP session event is detected by the Call 10 Session Control Function (CSCF) due to a set-up of a media-flow connection between the monitored party (A) and a second party (B). - A resource set-up message (SIP1) is sent via an interface (Mr) from the Call Session Control Function (CSCF) to a Multimedia Resource Function (MRF) in the service domain. - A SIP transaction is established between the Multimedia Resource Function (MRF) and a third Delivery Function (DF3). - A SIP session is established between the third Delivery Function (DF3) and a Law Enforcement Monitoring Facility (LEMF).