Additional Details ------------------------------ Product description: The Avaya / Lucent Partner 308 EC adds 3 lines and 8 telephone capacity for ACS R3.0 systems and higherCaller ID built-in (Caller ID must be provided by local carrier)Fax detection and routing available Universal Port Structure allows multi-line analog phones or single line devices (fax machine, credit card machine, modems, etc.)Compatible with Partner ACS Processors Release 2.0 or higher