These are all of the Yealink line key types and values usable with devices that support them:
0 = N/A
1 = Conference
2 = Forward
3 = Transfer
4 = Hold
5 = DND
7 = Recall
8 = SMS
9 = Directed Pickup
10 = Call Park
11 = DTMF
12 = Voice Mail
13 = Speed Dial
14 = Intercom
15 = Line
16 = BLF
17 = URL
18 = Group Listening
20 = Private Hold
22 = XML Group
23 = Group Pickup
24 = Paging
25 = Record
27 = XML Browser
28 = History
30 = Menu
33 = Status
34 = Hot Desking
35 = URL Record
38 = LDAP
39 = BLF List
40 = Prefix
41 = Zero Touch
42 = ACD
45 = Local Group
50 = Keypad Lock
51 = Switch Account Up
52 = Switch Account down
56 = Retrieve Park
61 = Directory
66 = Paging List
72 = Missed Call
73 = Custom Key
77 = Mobile Account
104 = Google Contacts
105 = XML Park
150 = Extend
310 = Dect Intercom
If you have any questions, please contact our friendly Support Team on 0330 122 6000, or send us an email at help@yay.com.