APP HAS BEEN UPDATED TO AUTO ENABLE CALL RECORDING ON BOOT, no more having to 'tap the app' after a reboot to enable!
After your device FULLY boots up, a notification message will appear in the status bar/pull down to let you know call recording has been enabled, it will go after 10 seconds if you don't swipe it away, there is also a 'read me' link in the notification message if you want to read the short info. You are probably better off uninstalling the previous version before installing the newer version. Don't forget to grant root on first launch!
This works with OOS OB9 and 4.1.6 (maybe earlier/other versions as well?) and has been confirmed working with OP3 (not sure which firmware versions) as well (thanks to @dianoandr)
If you try it on other versions not listed above, please let us know if it works.
After installing, the first launch of the app will ask to grant it root, it needs to be granted root, so you will need to be rooted
All this app basically does is execute a command line.
Thanks to @esun for the command line used in this app.
UPDATED APP DOWNLOAD: Enable_Call_Recording2.apk
Left the one below here in case you do not want Call Recording to be enabled automatically on boot!
PREVIOUS OLDER DOWNLOAD: Enable_Call_Recording.apk
Please hit the 'Thanks' button if you use it, thanks