Agree with the management point. In no way the hotel/company would like to get involved with WG. Say IF something bad happened, they'll trace back to the original organiser and that will be the front desk colleague who is on duty! They'll be in trouble big time!
Bell boy can float about the hotel freely and can hide in a corner with you
, while you two make the call..
Or to be extra sly, you could order room service (food etc) and get the delivery person to make the call in your room