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How many calls can be completed in a pre-defined amount of time is the most common question concerning emergency notifications. The short answer, typically more than a local CO (central office) phone system can handle. In response to the congestion challenge, FirstCall developed the only Capacity Sensing technology in the industry. FirstCall’s Capacity Sensing capability allows calls to be delivered faster than any other notification system. The system senses and dynamically adjusts in real time when the volume of emergency calls will overload the CO. When the CO can take more calls we immediately increase the volume of FirstCall emergency calls. We eliminate fast-busy responses to provide the highest possible percentage of call completion.