There may be two issues. One is whether your dispatchers are in a safe room, depending on what disaster may befall them:

Design Guidance for Shelters and Safe Rooms -
http://www.fema.gov/txt/plan/prevent/rms/453/fema453.txt

Design and Construction Guidance for Community Safe Rooms
http://www.fema.gov/library/viewRecord.do?id=1657

The other issue is what they have with them in the room. Basically, that's a shelter in place situation, and I'd do a search on that to see what turns up that's applicable. They probably don't need to tape the windows and doors and such, but again that depends on their location and the disaster.