Abstract: The present invention relates to a method and network element for providing secure access to a packet data network, wherein a first source information is derived from a message received from a terminal device (40, 60), and is compared with a second source information derived from a packet data unit used for conveying said message, or derived from a security association set up between the terminal device and the data network. A protection processing for protecting the packet data network from a fraudulent user attack is then initiated based on the comparing result. Thereby, a simple and efficient protection mechanism can be provided without sending any additional information or providing any additional fields in the message.

Abstract: A method is disclosed for providing information related to an Internet Protocol (IP) Multi-Media (IM) Subsystem (IMS) to a mobile terminal. The method includes storing the information into a memory that is readable by the mobile terminal, and reading the stored information from the memory. The memory may be at least one of a USIM, an EEPROM or a RAM. In one embodiment the information is stored during a PDP context activation procedure. A wireless communications system that operates in accordance with the method is also disclosed.

Abstract: The present invention relates to a method and network element for providing secure access to a packet data network, wherein a first source information is derived from a message received from a terminal device (40, 60), and is compared with a second source information derived from a packet data unit used for conveying said message, or derived from a security association set up between the terminal device and the data network. A protection processing for protecting the packet data network from a fraudulent user attack is then initiated based on the comparing result. Thereby, a simple and efficient protection mechanism can be provided without sending any additional information or providing any additional fields in the message.

Abstract: A method is disclosed for providing information related to an Internet Protocol (IP) Multi-Media (IM) Subsystem (IMS) to a mobile terminal. The method includes storing the information into a memory that is readable by the mobile terminal, and reading the stored information from the memory. The memory may be at least one of a USIM, an EEPROM or a RAM. In one embodiment the information is stored during a PDP context activation procedure. A wireless communications system that operates in accordance with the method is also disclosed.