Abstract: The present invention relates to a method and an arrangement in a data communications system in Internet Protocol (IP) environments. The object of the invention is to achieve a simple way of remote and secure access of a computer to a private data communications network. The solution according to the invention is a Remote Access Login system profiled for accessing the private data communications network via a so-called Pseudo-Connectionless Technology (PCT) device.

Abstract: Methods and systems for signalling between a mobile station and a network for requesting supplementary services are disclosed. The network implicitly assumes that signals from a mobile station relate to either a held or active call or that a second action is required after the requested action is performed so that the complexity of the mobile unit can be reduced.

Abstract: A roaming arrangement enables roaming between different types of networks in a telecommunication system that includes a first standardized type of mobile network, a so-called home network, and a second standardized type of mobile network, a so-called guest network. A subscriber has an identity that is common for both the home network and the guest network. The roaming arrangement includes a signal handling arrangement, at least one home interface towards the home network, and at least one guest interface towards the guest net. A first signalling format between the arrangement and the home network is of the same type as a corresponding format in the home network. Also, a second signalling format between the arrangement and the guest network is of the same type as a corresponding format in the guest network.