Project 25 digital radio systems may support, as a standard option, a set of data communications bearer services. This document provides a detailed specification of the Internet Protocol (IP) packet data communication bearer services such that, where these packet data bearer services are enabled, data connectivity will operate through any Project 25 radio, across any Project 25 digital radio system, independent of the particular equipment manufacturer, adhere to the Common Air Interface, and similarly in trunking or conventional system modes.