Telefónica Germany, the largest mobile operator in terms of subscribers, has selected Ericsson's IP Multimedia Subsystem (IMS) solution for its VoLTE deployment across all of its 4G LTE coverage areas. Telefonica is expected to launch the VoLTE service to its customers once the company has secured the full VoLTE device eco-system for mass-market launch.
Ericsson will provide its range of IMS products, including CSCF (Call Session Control Function), MTAS (Multimedia Telephony Application Server), MRS (Media Resource System) and System Integration Services for Telefónica's multivendor network.
Ericsson's IMS solution will enable Telefonica subscribers to enjoy HD voice call quality with simultaneous data usage on 4G LTE. The solution will serve as a common IMS core network for mobile and fixed sevices, providing converged high-quality multimedia services such as video calling, video conferencing and collaboration services.
According to a statement by Ericsson, Telefónica is one of the first operators in Europe that has now completed the upgrade of their network to be ready for commercial VoLTE launch. In addition, Ericsson's SRVCC (Single Radio Voice Call Continuity) functionality enables seamless handover of ongoing voice calls from LTE to circuit-switched 3G and 2G networks.