Whose responsibility is it to provide back up coverage for a front desk receptionist when she is scheduled for vacation or doctor's appointments? As a rule of thumb, most companies have the admins rotate lunch and breaks, or some kind of arrangement. At my company, management has not designated anyone as a backup. They expect the receptionist to go around asking people in the company if they'll volunteer to be her scheduled backup, which puts her in an awkward position. 

I think it's not her role and she's not in a position to assign someone within the company. Management needs to decide how critical front desk coverage is, and come up with a working permanent solution. Am I right?