Siemens OptiPoint 500 Advanced Telephone (White/Refurbished)The OptiPoint 500 Advance is the elite digital telephone with full duplex speakerphone for executives, administrative assistants and call center agents. The OptiPoint 500 Advance offers advanced functionality with 19 keys with LEDs to indicate line or feature status that make it easy to add call center functions like Available Unavailable, Wrap Up and more. Key Features: Mnfr Part #: L30250 F600 A116 Full duplex speakerphone with back lit display 19