Abstract: A method of detecting telephony fraud in the case of a mobile telephony device roaming at a visited network, the visited network being other than a home network of said mobile telephony device, cross-network triggering being available between said visited network and said home network. The method comprises detecting a non-correlation between said cross-network triggering and activity of said mobile telephony device, testing to find out if profile manipulation has taken place of a profile of said mobile telephony device held at said visited network, and upon detecting that profile manipulation has taken place taking remedial action such as blocking current calls and overwriting the manipulated profile.

Abstract: A method of detecting telephony fraud in the case of a mobile telephony device roaming at a visited network, the visited network being other than a home network of said mobile telephony device, cross-network triggering being available between said visited network and said home network. The method comprises detecting a non-correlation between said cross-network triggering and activity of said mobile telephony device, testing to find out if profile manipulation has taken place of a profile of said mobile telephony device held at said visited network, and upon detecting that profile manipulation has taken place taking remedial action such as blocking current calls and overwriting the manipulated profile.

Abstract: A method of managing voice calls in LTE/4G telephony for a mobile handset roaming outside of its home network in a network where voice calls use 3G technology, using a Global Location Register (GLR) which is designed to manage registrations without informing the home network. The method involves registering the mobile handset in 4G at the roaming network, obtaining and prestoring 3G information for the mobile handset from the home network while the mobile handset is registered in 4G, obtaining a voice call request for the mobile handset; and reregistering the mobile handset in 3G at the roaming network to use circuit switch fallback for the voice call, the reregistering comprising using the prestored 3G information so that the home network does not have to be contacted.

Abstract: A method of managing voice calls in LTE/4G telephony for a mobile handset roaming outside of its home network in a network where voice calls use 3G technology, using a Global Location Register (GLR) which is designed to manage registrations without informing the home network. The method involves registering the mobile handset in 4G at the roaming network, obtaining and prestoring 3G information for the mobile handset from the home network while the mobile handset is registered in 4G, obtaining a voice call request for the mobile handset; and reregistering the mobile handset in 3G at the roaming network to use circuit switch fallback for the voice call, the reregistering comprising using the prestored 3G information so that the home network does not have to be contacted.

Abstract: CSFallback controller allows a long term evolution (LTE) supporting telephone handset to communicate over a network that does not support LTE voice calls, using circuit-switch fallback (CSFallback). The CSFallback controller comprises a visited side signaling output to provide visited side signaling to respond to a mobile terminated call to an mobile handset supporting LTE by locating said handset and an MSC currently serving said handset, using an emulation of HLR signaling for locating the handset and the MSC and a home side signaling output, to provide home side signaling to an HLR associated with the handset. The home side signaling is an emulation of signaling from a serving MSC. The controller transfers the call for handling by the identified currently serving MSC.

Abstract: CSFallback controller allows a long term evolution (LTE) supporting telephone handset to communicate over a network that does not support LTE voice calls, using circuit-switch fallback (CSFallback). The CSFallback controller comprises a visited side signaling output to provide visited side signaling to respond to a mobile terminated call to an mobile handset supporting LTE by locating said handset and an MSC currently serving said handset, using an emulation of HLR signaling for locating the handset and the MSC and a home side signaling output, to provide home side signaling to an HLR associated with the handset. The home side signaling is an emulation of signaling from a serving MSC. The controller transfers the call for handling by the identified currently serving MSC.

Abstract: Apparatus for local access to data while roaming with a mobile telephony device at a roaming network. The apparatus is located at the roaming network and comprises a filter having a data packet or packet header inspection unit for inspecting packet information or headers to identify data packets addressed from the roaming telephony device for use via a home network data packet gateway, and a packet diverter for diverting at least some of the identified packets to a local data packet gateway; the filter setting up a diversion tunnel for additional packets of the same session for directly routing all packets of the identified session to the local data packet gateway. Mobile devices are today programmed to send data to their home network for browsing via the home network data packet gateway. The filter allows data to be redirected to the roaming network so that Internet browsing and like data uses can be carried out directly by the roaming user at less cost and greater efficiency and quality of service.

Abstract: Apparatus for local access to data while roaming with a mobile telephony device at a roaming network. The apparatus is located at the roaming network and comprises a filter having a data packet or packet header inspection unit for inspecting packet information or headers to identify data packets addressed from the roaming telephony device for use via a home network data packet gateway, and a packet diverter for diverting at least some of the identified packets to a local data packet gateway; the filter setting up a diversion tunnel for additional packets of the same session for directly routing all packets of the identified session to the local data packet gateway. Mobile devices are today programmed to send data to their home network for browsing via the home network data packet gateway. The filter allows data to be redirected to the roaming network so that Internet browsing and like data uses can be carried out directly by the roaming user at less cost and greater efficiency and quality of service.

Abstract: A global location register (GLR) provides a proxy for visitor location registers to the home location registers to avoid updating of the external network with location update notifications upon transfer of a roaming user between visitor location registers. The standard GLR is extended by being configured with multiple addresses, has a soft shutdown procedure, has a blacklist mechanism, a searching facility for finding lost roaming users, and has a mechanism for overcoming ambiguities in local identification numbers assigned by visitor location registers.

Abstract: A global location register (GLR) provides a proxy for visitor location registers to the home location registers to avoid updating of the external network with location update notifications upon transfer of a roaming user between visitor location registers. The standard GLR is extended by being configured with multiple addresses, has a soft shutdown procedure, has a blacklist mechanism, a searching facility for finding lost roaming users, and has a mechanism for overcoming ambiguities in local identification numbers assigned by visitor location registers.