Why Voice in 5G NSA is not transmitted by NR node?

Hi Experts.
In 5G NSA, even EPC is connected to IMS, why Voice is not transmitted by NR node?
Does gNB in NSA don’t support QCI1?

SCG is not intended for IMS (qcis 1 and 5 traffic).
It is in the 3GPP specs.

Only for QCI 6~9?