Coss Communications LLC. is a family owned business, founded in 1986. We are currently the #1 provider of T-Mobile and AT&T cellular service for all brands of elevator phones; eliminating the need for expensive dedicated telephone lines. We specialize in the sales, service and installation of elevator telephones and are the preferred vendor for Otis, Schindler and Thyseenkrupp Elevator. Additional Services: - Emergency cellular communications - Business telephone systems - Paging systems - Access control systems - Camera systems - Public address systems - Nurse-call systems