This document is intended to clarify key aspects of the operation of Project 25 subscriber@ base@ and repeater station equipment in the interests of conformance. It includes a set of PCP items or procedures for basic conventional operation as follows: PCP 1.1 ?C Voice Calls ? PCP 1.1.1 ?C Group Call via Repeater Operation ? PCP 1.1.2 ?C Individual Call via Repeater Operation ? PCP 1.1.3 ?C Group Call Direct Operation ? PCP 1.1.4 ?C Individual Call Direct Operation It is consistent with other pertinent APCO Project 25 Conformance Profiles@ namely: Project 25 Conformance Profile ?C Level 2 (Advanced Conventional Operation) Project 25 Conformance Profile ?C Level 3 (Basic Trunking Operation) Project 25 Conformance Profile ?C Level 4 (Advanced Trunking Operation) Project 25 Conformance Profile ?C Level 5 (Phase II Trunking Operation) This document is primarily aimed at manufacturers and conformance test facilities to serve as a standard reference of conformant air interface signaling@ as a means of assisting manufacturers in the development of conformant Project 25 equipment. It also defines a framework against which manufacturers may describe the conformant behavior of their Project 25 products. It is not designed as a functional interoperability test suite for end users@ for which readers are referred to [7]. This document assumes an audience familiar with terms and definitions contained in the APCO P25 standards.