Vendors that have a diverse mix of assurance capabilities covering LTE, legacy CS voice and IMS will be well-placed to win VoLTE assurance contracts. Voice over LTE (VoLTE) enables operators to fully migrate customers to LTE and accelerate take-up of new data services, at the same time as improving spectral efficiency. However, the quality of service (QoS) expectations of a voice service and the inherent technology complexity of VoLTE will require investments in service assurance systems.