This document provides guidance on voice provisioning for CAT and outlines the key steps for converting from an Avaya PBX using dedicated SDN access to a Cisco IPT system with switched SDN access. It defines relevant terminology like SDN, PRI, and DID ranges. It also lists the essential ingredients for a successful cutover, including ordering new local and long distance PRIs, disconnecting old SDN ranges, porting DID ranges, and coordinating the separate cutovers for local and long distance numbers.