Yealink SIP-T2 SERIES Administrator's Manual page 360

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
X ranges from 1 to 21 (for SIP-T27P)
X ranges from 1 to 3 (for SIP-T40P/T23P/T23G)
X ranges from 1 to 2 (for SIP-T21(P) E2)
For programable keys:
X ranges from 1 to 4.
For ext keys:
X ranges from 1 to 6, Y ranges from 1 to 20, 22 to 40 (Ext key 21 cannot be configured).
Web User Interface:
DSSKey->Line Key/Programable Key->Label
Phone User Interface:
Menu->Features->DSS Keys->Line Key X->Label
To configure a DND key via web user interface:
Click on DSSKey->Line Key (or Programable Key).
1.
In the desired DSS key field, select DND from the pull-down list of Type.
2.
(Optional.) Enter the string that will appear on the LCD screen in the Label field.
3.
Click Confirm to accept the change.
4.
To configure DND feature via web user interface:
Click on Features->Forward&DND.
1.
In the DND block, mark the desired radio box in the Mode field.
2.
If you mark the Phone radio box:
a)
Mark the desired radio box in the DND Status field.
1)
(Optional.) Enter the DND on code in the DND On Code field.
2)
336
Parameter Permitted Values Default