NENA Company Identifiers (also known as Company IDs or CIDs) allow 9-1-1 centers to quickly identify the telephone company or access infrastructure provider responsible for a particular telephone number.

CIDs allow 9-1-1 centers to request emergency network services, such as busy line interrupt and call trace, when required to save lives and protect property. Additionally, CIDs help to ensure that accurate caller location information can be provided to 9-1-1 centers (PSAPs) and first responders when a user calls 9-1-1. CIDs also facilitate timely restoration of service during certain network or equipment outages.

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