Ericsson - Unlike previous 3GPP wireless technologies, LTE has no circuit-switched bearer to support voice, so carrying voice over LTE requires a migration to a voice over IP (VoIP) solution – commonly under the umbrella of IMS. Until this migration occurs, LTE-capable handsets need to revert to 2G or 3G for voice calls: an approach that is not ideal in the long term. Driven by major operators, the voice over LTE (VoLTE) ecosystem is maturing rapidly and tracking well to target commercial timelines.

Efforts to validate voice over LTE (VoLTE) from an E2E perspective, which have been under way for more than a year, have the key objective of retaining users.

Authors: Michael Anehill, Magnus Larsson, Göran Strömberg and Eric Parsons

Download tutorial