This particular model is an exceptionally designed telephone. Some other marvelous featureson this phone are the well placed hold and release buttons. These are perfectly located right inthe middle of the phone. As well they are color coded for perfect distinction. Below those 2feature keys is the number pad that is used to make all of your out bound calls as well interoffice call transfers. Along the bottom of the phone is the volume control bar. This controls thevolume for the headset along with the built in hands free speaker. This phone comes with a highquality speakerphone for hands free operation.The phone does support Multiple Appearance Directory Numbers. It is also compatible withMeridian M536 and M518 add on modules for line features expansion. Another unique designwith the phone is the part number NT4X37. This makes for an uncomplicated way of looking upthe correct phone for purchase. This amazing phone comes in 2 exceptional colors Ash, Black.