The Cisco SPA500DS Digital Expansion Module is an ideal solution to simplify incoming call handling by quickly directing calls to the requested party & monitoring line status from a central location. The 15-button attendant console easily attaches to a SPA500 Series IP Phone & provides up to 30 programmable call pickup or speed dial buttons through two page keys, each illuminating the line's status (idle, ringing, busy, or null) via the busy line field (BLF). Incoming calls can immediately be transferred to the proper location with the push of a button assigned to the extension. Features • 15 programmable buttons • Page Left & Page Right keys • Call transfer • XML Application • Speed dial • Busy lamp field • One-touch transfer • Call pickup