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Hi Support, what does this mean "VoLTE is a customized software feature"? I would like to know whether the Zyxel LTE3316-M604 supports VoLTE for the provider Telefonica O2 in Germany, or not. I know that Zyxel LTE3316-M604 supports in principle both voice modes VoLTE (4G) and CSFB (3G), but I am specifically interested in…
