Customer's zeal for mobile data services has obsessed operator to implement 4G LTE networks for better serving their subscriber with high bandwidth, more capacity, reduced latency and improved pricing thus LTE smartphone's mass market introduction has begun. Voiceover-LTE is designated voice calling solution in LTE mobile network and it is on the way of deployment worldwide. It has reshaped call services to VoIP i.e. packet switching from circuit switched telephony. VoLTE supports OPEX savings, higher spectral efficiency, improved voice call quality and more refined voice-based services. This paper clarifies the how and on which architecture VoLTE works, IMS routing, advantages of implementing VoLTE over CSFB, how VoLTE benefits both communication providers and their user bases, performance improvement with SRVCC indicating future enhancements and application areas, Challenges and opportunities.
LTE, VoLTE, IMS, SIP, SRVCC, CSFB, OTT
