Patent ID: 7295848

Claim:
A method of obtaining identification information on a monitored party in a communication network having a database for an intercepting party, the method comprising the steps of: supplying from the network identifier data for identifying a party to the database when a communication is originated from or received by a party to be monitored; storing the received identifier data in the database in correlation to respective parties to provide a concordance list containing several identifier data for each respective party, said list comprising an international mobile subscriber identity (IMSI) data field, a mobile subscriber integrated services digital network (MSISDN) data field, an international mobile equipment identity (IMEI) data field and an interception data field, said interception data field being set to yes or no depending on whether interception is required or interception is not to be performed, and only data relating to users that should be intercepted and data relating to active communications being stored in the database; determining whether identification information contained in a start command corresponds to identifier data stored in the database when receiving said start command to start a lawful interception by a legal interception gateway; determining whether an indicator in the interception data field is set to yes or no; and intercepting a call or blocking call interception depending on a content of the interception data field.