Web based solution to view live cameras across different locations and alarm monitoring

I am looking for an experienced web based solution provider to create a system to view live cameras across multiple locations and enable alarm monitoring. We have existing cameras and are looking for an integrated platform that will support motion and sound detection alarm monitoring, along with camera down, NVR down, HDD alarm, Temp monitoring, etc. This project requires the platform be web based so that users can view and access the platform remotely. The number of locations is yet to be determined. Experienced and knowledgeable providers are encouraged to apply and provide their suggestions to make this project a success.