FeaturesThis AT&T / Lucent / Avaya Spirit 308 base unit has a capacity of 3 lines and 8 telephones and supports Spirit system phones. This base unit is expanded with the AT&T/ Lucent / Avaya 616 expansion Module.3 Lines By 8 TelephonesExpandable to 6 By 16Includes RefurbishedLibraryAvaya ATT Spirit 308 616 Guide.pdf
