LAWFUL INTERCEPTION OF NON-LOCAL SUBSCRIBERS

摘要

The present application relates to monitoring non-local originating calls in a telecommunication system having a local network part and a non-local network part. A monitoring centre is attached to an Intercept Access Point in the local network part. A monitoring request comprising an external target identification is received from the monitoring centre to the Intercept Access point. A call is set-up of from an originating subscriber in the non-local network part, towards the local network part. An Initial Address Message comprising the originating subscriber's identity is received to the Intercept Access point from the non-local network part. A match is found between the Initial Address Message and the received target identification. Monitoring information related to the matched target is transferred from the Intercept Access Point to the monitoring centre.