As Has.007 said, most ROMs support this feature and I bet this ROM have it. Unfortunately, I cannot check it myself. I am in RR ROM right now. If you are on this ROM, you can take a screenshot, and post it here.
Post added at 01:46 AM ----------
Man these jio volte people
The app stays online for 2-3 hours gets offline again restarts it works fine but the problem is it doesnt receive incoming calls the outgoing works fine but incoming isnt hasnt recieved any calls :) since 2 days even i...
Recently when i restored my data using TWRP i faced a problem at lock screen.
I was not able to unlock my phone with the pin i set Earlier..So after so many attempts i was able to find a solution for that problem.(works with pattern,pin etc)