Protecting user's anonymity when visiting foreign networks

摘要

There are provided mechanisms for registering and subsequently communicating with classified subscribers in an IMS environment. The method comprises replacing an IMS Public -and Private User identity (IMPU/IMPI) with randomized temporary identifiers. Parties, in particular parties with 5 access to network entities outside the home-network cannot relate the observed IMPU/IMPI to the subscriber's original IMPU/IMPI as provisioned, and as the temporary IMPU changes frequently, there is no pattern (registration nor call) to be allocated to the subscriber's UE.