If you RTFA the key point is they picked IMS, which is essentially a form of high-reliability VoIP because it routes voice/SMS over IP. LTE is entirely IP based anyway so they had to use some type of VoIP-style system. Also mentioned in the article was that they could offer the same exact voice services over broadband "wireline" networks. I would imagine that in practice, IMS phones will be able to switch to wi-fi backhaul just like current UMA handsets do.
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If you RTFA the key point is they picked IMS, which is essentially a form of high-reliability VoIP because it routes voice/SMS over IP. LTE is entirely IP based anyway so they had to use some type of VoIP-style system. Also mentioned in the article was that they could offer the same exact voice services over broadband "wireline" networks. I would imagine that in practice, IMS phones will be able to switch to wi-fi backhaul just like current UMA handsets do.