# Phone Model M3903

When you connect a Nortel Meridian M3903 phone to a 3300 CITELlink Gateway and program it as a CITELlink Type1 device, the phone supports the following keys:

Button Label | Function
1 | Cancel
2 | Hold
3 | Quit
4 | Handsfree
5 | Mute
6 | Headset
7 | Program
8 | Message
9 | Unused
10 | Directory
11 | Previous
12 | Transfer/Conference
13 | Shift
14 | Unused
15 | Copy
16 | Next
17 | Unused
18 | Prime Line
Shift + 18 | Down Arrow
19 | Feature Key 2
Shift + 19 | Superkey
20 | Message Indicator Light