Inter-tel Axxess 550.8600 IP Endpoint Phone (Charcoal/Refurbished)Key Features: Mfr. Part #: 550. 8600 Intertel Axxess IP Endpoint Phone Provides access to features such as hold, transfer, conference and forward Offers hold button, ring and volume control buttons and on hook dialing Allows users to enable Do Not Disturb (DND), sending calls to voice mail when the user is unavailable Provides red LEDs (Light Emitting Diodes) to indicate a call is active, ringing or holding Includes headset support, message waiting