This don't trip KNOX nor need root, it evens get's you samsung Pay where it's not available!!
But you'll have to factory reset your device
There are a few countries where call recording is not ilegal so we must pretende that our phone is from that country, to do that we need to chage the CSC code to that specific country. India is one of these and CSC code of India is INS
I'm from Portugal (CSC = TPH) , i own a N950F DS, and i managed to make call record working by changing CSC of my device to INS (India)
(This probably will work on other note models) without triping KNOX or root
1- Take SIM out (if you leave the SIM in it will revert to your operator CSC)
2- Flash Combination firmware with Odin:
(COMBINATION_FA71_N950FXXU5ARI1_CL12991683-i have bootloader 5 EXYNOS)
This will install a special firmware to your device that is used for technical purpose
On ODIN Put it under AP and leave everything Default
3- Change CSC :
(this is real simple, don't be scared)
4- Flash PIE rom with Odin:
(Any PIE rom will do except the carrier specific)
In my case i flashed India
5- Configure, let update, (i ended up with the India SamsungPay not available in my country, you can disable it after)
6- Turn off and insert SIM, and Turn on
Now the important thing:
Everytime you restart the pone it will ask you to restart as a SIM card was changed, Hit Cancel and ignore it or it will change to you CSC again once it boots up.
After 2 days of using intensely i decided to hit restart and confirm the new SIM restart.
Didn't lose my setings and Call record still present and now i have INS/TPH/PAK CSC,
Call recording is working fine.
Hope it helps someone and please leave a like, for at least i know if i helped someone and it's worth to make any post here