Siemens optiPoint 500 Entry Phone - Refurbished - ManganeseTwo volume control keys Offers many of the advantages of digital technologymulti line capability and feature keys with LEDs Great for common use areas including lobbies, break rooms and warehouse locations Works with Hicom 150 H, Hicom 300 H, HiPath 3000 and HiPath 4000 communication platforms Evolution: Upgrade to IP enabled telephony workpoint with the optiPoint IPadapter Get unique port sharing functionality Improve communications with computer