Following Ericsson's LTE roaming announcement with Swisscom last week, TeliaSonera said it has joined hubs with iBasis--the international carrier owned by KPN--to "ensure interoperability and a consistent user experience for roaming LTE subscribers." The two international wholesale carriers said they will interconnect their Diameter signaling and data hubs to enable LTE roaming. They will also migrate all legacy services to the new IPX interconnect to provide GSMA-standard IPX features such as end-to-end quality of service, security, multilateral connectivity and cascading payments. "This is a significant event between two heavy weight LTE roaming players," said Simon Sherrington, managing director of Innovation Observatory. "IPX market growth will be delivered by LTE roaming and interoperability services, voice services (including VoLTE), high-quality international data services, rich media and advanced telephony services. We can expect to see new value-added services designed to make service provision more efficient and which help operators identify potential customers." Release