Method and an arrangement relating to communications systems

Abstract

The present invention relates to a method of blocking undesired traffic in data communication systems that uses packet switching. Blocking is effected by determining the sender address of incoming data packets, and then comparing this address with a list of reliable addresses. The data packet is erased immediately, if the sender addresss is not included in the list. The list of accepted addresses can be created in several wayoi among others by including in the list addresses to which the user has himself sent data, these addresses therefore being considered reliable addresses. Addresses of friends and acquaintances can also be inserted in the list manually. The invetion thus enables undesired data from unreliable senders to be avoided. Such data loading limited resources, such as wireless internet connections for example. Neither is there any risk of the receiver being required to pay for information that he himself has not requested.

Dependencies are inferred from the claim text.