From the Introduction: "The Cybersecurity and Infrastructure Security Agency (CISA) developed the 'Funding Mechanisms Guide for Public Safety Communications' in 2015, with this update published in 2021, to assist public safety agencies in identifying funding sources for emergency communications projects. This document describes common funding mechanisms (e.g., bonds, public-private partnerships, user fees, 911 surcharges, leasing equipment, special taxes, grants), including strengths, challenges, opportunities, and other considerations impacting public safety agencies' decisions. In addition to funding mechanisms, this document also provides associated best practices for public safety agencies when developing emergency communications projects. Most notably, agencies should identify and secure funding for the entire system lifecycle--beginning with initial capital investments, through ongoing maintenance and operations, replacement parts, and finally, disposition and transition to new capabilities once a system has reached its useful end-of-life."
Cybersecurity and Infrastructure Security Agency: https://www.cisa.gov/