In a very un-shocking piece of news, Verizon announced that their new SIP/IMS based VoLTE service won't hand calls back to their existing CDMA network.
Basically there's no compatibility between the CDMA network which Verizon uses today to carry hundred of millions if not billions of voice minutes, and it's new VoLTE voice network. Verizon is building an entirely new voice network, and is struggling to find a way to make the old and new compatible.
Of course a VoLGA solution supports seamless call handover to/from the existing GSM/3G networks. It did almost two years ago.
Is this causing a fragment in Verizon's market???