Voice and SMS delivery over LTE is a hot topic with many different variations (See Voice Over LTE options) in approaches. There is no consensus among operators and there were many articles claiming that IMS solution is a distant future.
According to Verizon’s press release , AT&T*, Orange, Telefonica, TeliaSonera, Verizon, Vodafone, Alcatel-Lucent, Ericsson, Nokia Siemens Networks, Nokia, Samsung Electronics Co. Ltd., and Sony Ericsson have defined the preferred way to ensure the smooth introduction and delivery of voice and SMS services on Long Term Evolution (LTE) networks worldwide.



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