Avaya Definity TN750B Announcement Circuit Pack (Refurbished)Key Features: Records and stores announcements that can be played back on demand as part of a calling feature 16 channels Required for Multiple Integrated Announcements feature Provides on board flash memory to provide internal backup of the announcements on the board 16kbps compression rate (adequate fro VDN of Origin Announcements) provides a total capacity of 5210 seconds