Do you want Answer your incoming call automatic then simple installs "Auto Answer Call".
Auto Answer have some more option are there.
1) Auto answer Activate Loud Speaker automatic.
2)Set Duration to Answer your call or pic your call like after 5 or 10 ,15, 25, 30, 35, 40 seconds.
3)An Option to set full screen caller ID. for this you can pic photo from gallery.
4)Reject Call with Send message like busy note.