Actually and so far there are no area codes for Qatar.
Since USA is the country from which they will call you they need to dial as follows
011, this is access to international calls, then 974 country code for Qatar, and finally the phone number you have here either land line or mobile, this is
011-974-XXXXXXX.
Also depending on the country you will have to dial a different number to access international calls or even go through an operator to guide you in dialing or connecting the phone call.
Actually and so far there are no area codes for Qatar.
Since USA is the country from which they will call you they need to dial as follows
011, this is access to international calls, then 974 country code for Qatar, and finally the phone number you have here either land line or mobile, this is
011-974-XXXXXXX.
Also depending on the country you will have to dial a different number to access international calls or even go through an operator to guide you in dialing or connecting the phone call.
Best regards