Method, system, and network element for monitoring of both session content and signalling information in networks

The invention provides a method and system for intercepting at least one session involving at least a first and a second network of different types. For interception both signalling information of the at least one session, and session content related to the same session provided in another of the first and second networks are monitored. An indication to start interception is delivered from one of the first and second networks to the other one of the first and second networks. The first network can be an IP Multimedia Subsystem, IMS, network, and the second network a General Packet Radio Service, GPRS, network.