Can we do high traffic on QCI 5 which is generally used for IMS signalling?

Specs & Protocol Testing
1

Hi 5G/LTE Experts.

Can we do high traffic on QCI 5 which is generally used for IMS signalling?

2

Yes, we can.

3

Won’t it force to use SN 18 bits and not 8 bits?

And will not affect IMS signalling when it comes?