Hello Experts.
Did any one hear about a voice solution called SVLTE?
In theory it is a voice solution alternative to VoLTE.
But it needs an overlay coverage for 3G and 4G.
And dual radio connection.
Voice service run on 3G data on 4G.
I never heard a live deployment of this…
Usual ways for LTE voice are CSFB and VoLTE.
Yes. It has many limitations.
Voice on CS, Data on LTE.
Was used a little bit during CDMA days but doubt there are deployments after VoLTE became mainstream.
Simultaneous Voice and LTE (SVLTE)
You can check this (2011) blog: 
The 3G4G Blog: Simultaneous Voice and LTE (SVLTE)
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