My security people (as I have more than one) have these instructions from me:
1. Call me if no answer on personal and work phone
2. Call the clients number I have given them
3. Call the Police and give them the information and why they are concerned
This goes for new clients for incall , as well as all outcalls. If its a hotel then I ask after point 2 they call the hotel reception and voice their concerns so they can follow up.
Under no circumstances do I want my security person to put themselves in any danger, so I dont want them coming to my rescue in person. Leave that to the professionals.
Its good to have procedures such as these in place before you take any bookings, and discuss in full with your security person(s). So there is no confusion and your system works if needed.
Hugs
Penny x x x