Description: 
(Optional.) Configures the label displayed on the LCD screen for each DSS key. 
For line keys: 
X ranges from 1 to 29 (for SIP-T48G/S) 
X ranges from 1 to 27 (for SIP-T54S/T46G/T46S/T29G) 
X ranges from 1 to 15 (for SIP-T42G/T42S/T41P/T41S) 
X ranges from 1 to 21 (for SIP-T52S/T27P/T27G) 
X ranges from 1 to 3 (for SIP-T40P/T40G/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: 
For SIP-T54S/T52S: 
X ranges from 1 to 3, Y ranges from 1 to 60. 
For SIP-T48G/T48S/T46G/T46S: 
X ranges from 1 to 6, Y ranges from 1 to 40. 
For SIP-T29G/T27P/T27G: 
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 
Description: 
(Optional.) Configures the short label displayed on the LCD screen for line key. 
Note: It is only applicable to SIP-T52S IP phones.