Intercom/mass notification system

Requirement- Provide a wireless point-to-point and WiFi capable, intercom/mass notification system for 20 laboratories, office, and chemical storage buildings. System will require speaker call stations, in and outdoor IP and standard speakers, and amplifiers (some speakers will be EX environment rated) . It is required to tie newly constructed buildings with 40+ year old facilities across a 200-acre research complex. Intercom must have announcement delay to prevent feed back and be fully expandable for future requirements. If interested please provide information about the system to be installed, company information, cage code, business size standard and rough order of magnitude(ROM). Market research is being conducted to determine if this effort can be set aside for small business. Please limit responses to 2 pages.