As SSgt Bruskowiz stated, you cannot call record on WinPhone. Any apps running when a call comes in/out will automatically have it's access to the mics disabled. That's for security.
The only way I can see MS allowing call recording is if it's managed by a Group Policy, thus it'll need to be connected to a MS-powered corporate network. Possibly a function for Win10, but definitely not Win8.1.
G.