Additional Details ------------------------------ Product description: The Avaya Partner ACS 509 Release 7.0 Processor provides 5 outside lines and 9 stations for Partner telephones. Partner ACS R7.0 Compatibility: Voice Mail Systems - Partner Mail VS (R1-R4.1 and R5.05 or higher), Partner Messaging, and Partner Voice Messaging PC Cards Expansion Modules - 200/200E, 206/206E, 308EC, 400E/400EC, 012E, T1, 1600 DSL Telephone Sets - Standard Single Line, MLS, Eurostyle, and Eurostyle Series 2