Although single radio voice call continuity (SRVCC) is on track to become commercially available this fall, 84 percent of operators surveyed by Infonetics do not actually expect the feature to be ready this year.
SRVCC, a capability open to GSM as well as CDMA operators, hands over a call from the LTE network to a legacy circuit-switched 2G or 3G network. Verizon Wireless (NYSE:VZ) has said it will not use SRVCC because it expects to cover its entire service footprint with LTE by mid-2013, meaning it will not need a circuit-switched backup.
\\fiercebroadbandwireless.com
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