Paging technology has continuously served as an integral part of public safety operations. This technology has evolved from simplistic, one-way tonal notification to more complex, two-way forms of communication that enable more immediate and appropriate response through the sharing of critical information. Paging technology brings value to public safety operations and public alerting because it facilitates immediate situational awareness.

CISA, SAFECOM, and the National Council of Statewide Interoperability Coordinators (NCSWIC) developed the Paging: A Vital Link for Public Safety document to promote a basic understanding of paging technology usage in emergency communications. The document describes the value of paging to public safety operations, outlines considerations when implementing paging technology, explores best practices surrounding paging technology use, and suggests considerations to be addressed as technology evolves. 

Original source can be found here