I dont have alot of experience but im going to try to help haha, i got out of school about a year ago and coudnt find a job and recently i got one servicing at&t cell sites but everytime we arrived at a site we had to call cbre and tell them we were there and when we left we had to call them and tell them what we serviced and all that good stuff, i dont know what that company does but i though it was just the people who give ojt the service calls, sorry i couldnt help more but thats all i know about them.