MotoAnswer

Unfortunately, not all smartphones offer the ability to automatically answer incoming calls while you're driving or when you can't use your hands. This feature can be extremely useful in the case of us bikers who travel with a intercom or a headset wired into the helmet and we can not (or do not want to) use the hand to respond.
MotoAnswer can also help you when you are in-vehicle and you want all incoming calls answered by the loudspeaker or just when the headphones are connected.

MotoAnswer does exactly this for you, it automatically answers incoming calls after a certain time (configurable by settings) and when certain conditions are met.

The app can always be left active as does not consume any battery.

MotoAnswer can also be used by people with disabilities by connecting the smartphone to a bluetooth prosthesis or is also able to answer all incoming calls via speakerphone.
The latter option is particularly useful for all those people who are unable to use their hands.

N.B. For all users with huawei or xiaomi smartphones, it is necessary to modify the energy saving options corresponding to MotoAnswer that the operating system sets by default.
To do this, read here