1. Dan Warren Senior Director of Technology, GSMA Letting LTE Find its Voice

2. The Voice challenge for LTE ■ LTE is an all-IP mobile network –No support for ‘traditional’ CS domain voice –New Voice and SMS solutions required CSFB, VoLGA, ‘One Voice’ ■ The risk – industry fragmentation –Poor customer experience –No common implementation –Economies of scale are lost ■ The Reality – the industry knows where it is going –GSMA Voice over LTE (VoLTE) backed by 3GPP, NGMN, IMTC… –Massive backing from operator and vendor community. –‘Migratory solutions’ filling the gap between LTE launch and IMS deployment for some operators.

3. Target solution - GSMA VoLTE GSMA VoLTE – the industry solution for Voice over LTE – Based on 3GPP IMS specifications – Defines ‘minimum required functional set for voice service equivalent to that experienced today’ GSMA adopted work of ‘One Voice’ on January 8 th 2010; announced VoLTE 15 th February 2010. UNI published on 27 th April 2010 NNI for interconnect documented during June 2010 GSMA now working on Roaming Architecture

4. Completing the work GSMA Working Groups with expertise in –inter-network charging –interoperability with existing systems –handover from IMS to CS domain –Interconnectivity models –Interaction with other industry bodies You can be involved! volte@gsm.org www.gsmworld.com/volte