Voice over LTE (VoLTE) empowers 4G LTE operators to offer rich voice, video and messaging services as a core offering.

Transformation of circuit-switched networks that carry voice to all-IP 4G LTE networks will realize cost advantages and recover inefficient spectrum for additional data capacity. With 4G, LTE operators can leverage service ubiquity, access mobility, global interoperability and universal user identity of phone number to enable continued monetization of voice and messaging. These fundamental values help mobile operators compete against the OTT web-based service providers and establish an environment where new user experiences can be offered to any generation of mobile devices.