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VoLTE Service Description and Implementation Guidelines ...
www.gsma.cominteroperable, high quality IMS-based telephony service over LTE. The NNI for VoLTE is defined in the IMS Roaming & Interworking Guidelines GSMA PRD IR.65 [51]. VoLTE Roaming is defined in the LTE Roaming Guidelines GSMA PRD IR.88 [53]. This document defines the VoLTE service description and implementation guidelines in