Yealink SIP-T2 SERIES Administrator's Manual page 614

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
X ranges from 1 to 2 (for SIP-T21(P) E2)
For programable keys:
X=1-6, 9, 13 (for CP860)
For ext keys:
X ranges from 1 to 6, Y ranges from 1 to 20, 22 to 40 (Ext key 21 cannot be
configured).
Example:
linekey.2.type = 24
Default:
For SIP VP-T49G/SIP-T48G IP phones:
The default value of the line key 1-16 is 15, and the default value of the line key
17-29 is 0.
For SIP-T46G/T29G IP phones:
The default value of the line key 1-16 is 15, and the default value of the line key
17-27 is 0.
For SIP-T42G IP phones:
The default value of the line key 1-12 is 15, and the default value of the line key
13-15 is 0.
For SIP-T41P IP phones:
The default value of the line key 1-6 is 15, and the default value of the line key 7-15
is 0.
For SIP-T27P IP phones:
The default value of the line key 1-6 is 15, and the default value of the line key 7-21
is 0.
For SIP-T40P/T23P/T23G/T21(P) E2 IP phones:
The default value is 15.
For ext keys:
When Y=1, the default value is 37 (Switch).
When Y= 2 to 20, 22 to 40, the default value is 0 (NA).
For programable keys:
For CP860 IP phones:
When X=1, the default value is 28 (History).
When X=2, the default value is 61 (Directory).
When X=3, the default value is 5 (DND).
When X=4, the default value is 30 (Menu).
When X=5, the default value is 28 (History).
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Parameters Permitted Values Default