Abstract: A method for powering voice over long term evolution (VoLTE) in long term evolution networks. A VoLTE/VoWiFi is centrally enabled for any sized network without implementing an IMS core, but rendering almost the same user experience as standard VoLTE (except voice call continuity). A conventional 2G/3G CS roaming model is enabled for both signaling and media routing. A subscriber profile is cached at a carrier VoLTE platform to enable optimized call routing. A validation mechanism is provided in case IMS AKA authentication is not possible due to an operator not being able to provision authentication vectors via Cx, S6a or MAP interfaces. Terminating access domain selection is implemented whenever an MT call arrives, whereby a T-ADS application server is eliminated. Voice call continuity is implemented whenever a VoLTE customer in a call leaves LTE coverage in favor of 2G/3G coverage. A novel method to actuate call continuity is proposed using a call back and call merge method.

Abstract: A method for powering voice over long term evolution (VoLTE) in long term evolution networks. A VoLTE/VoWiFi is centrally enabled for any sized network without implementing an IMS core, but rendering almost the same user experience as standard VoLTE (except voice call continuity). A conventional 2G/3G CS roaming model is enabled for both signaling and media routing. A subscriber profile is cached at a carrier VoLTE platform to enable optimized call routing. A validation mechanism is provided in case IMS AKA authentication is not possible due to an operator not being able to provision authentication vectors via Cx, S6a or MAP interfaces. Terminating access domain selection is implemented whenever an MT call arrives, whereby a T-ADS application server is eliminated. Voice call continuity is implemented whenever a VoLTE customer in a call leaves LTE coverage in favor of 2G/3G coverage. A novel method to actuate call continuity is proposed using a call back and call merge method.

Abstract: In a method and system for APN (Access Point Name) correction in a GPRS data roaming scenario where a sponsor operator network is used and a method and system for routing GTP messages to the correct destination network entity after actuating the APN correction as and when required. The GTP filter checks the IMSI and APN data in the GTP layer and, depending on the IMSI and APN data performs APN correction and manipulates GTP parameters to ensure the PDP Context is correctly established between the SGSN and the GGSN, and the further GTP Control or Data messages bypass the GTP Filter application. This solution allows appropriate routing of message, in particular for message to and from smartphone.

Abstract: In a method and system for APN (Access Point Name) correction in a GPRS data roaming scenario where a sponsor operator network is used and a method and system for routing GTP messages to the correct destination network entity after actuating the APN correction as and when required. The GTP filter checks the IMSI and APN data in the GTP layer and, depending on the IMSI and APN data performs APN correction and manipulates GTP parameters to ensure the PDP Context is correctly established between the SGSN and the GGSN, and the further GTP Control or Data messages bypass the GTP Filter application. This solution allows appropriate routing of message, in particular for message to and from smartphone.