





The GSMA IR.92 voice-over-LTE and GSMA IR.94 IMS conversational video specifications are the preferred industry choices for mass-market voice and video calling services over LTE, satisfying user expectations and providing the most advantageous solutions for operators. With the industry aligned telecom solution, operators can now start commercial deployments of a telecom-grade, globally interoperable solution for voice and video calling over LTE – even before LTE is fully deployed.
The term voice-over-LTE (VoLTE) is used to describe the GSMA specification (IR.92) for voice and Short Message Service (SMS) in LTE. VoLTE has widespread backing in the telecoms industry – more than 40 key players declared their support for it at the 2010 GSMA Mobile World Congress in Barcelona and many more have done so since. VoLTE, together with video calling over LTE, will bring deployment of interoperable and high-quality voice and video services together, as well as facilitating the development of interconnect and international roaming agreements among LTE operators.
With voice and video calling over LTE solutions based on established telecom standards with full industry support, operators can start launching commercial services immediately. There is a great opportunity to build a whole new telecoms world with innovative communication services over IP networks, with real and lasting value for operators and consumers.
Voice and video calling over LTE – a step towards future telephony
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