AUDIX (AUDio Information EXchange) is a voicemail server intended to be used with a Lucent/Avaya private branch exchange (PBX). AUDIX features many integrations with Avaya PBXes, such as capturing the extension of the calling party and announcing that person's name (if they're also an AUDIX subscriber and have recorded their name on the system) when announcing the attributes of a message, automatic identification of subscribers when they are dialing in to retrieve their messages, and activating and deactivating message-waiting indicators