Description: 
Configures a DSS key as a DND key on the IP phone. 
The digit 5 stands for the key type DND. 
For line keys: 
X ranges from 1 to 29 (for SIP-T48G) 
X ranges from 1 to 27 (for SIP-T46G/T29G) 
X ranges from 1 to 15 (for SIP-T42G/T41P) 
X ranges from 1 to 21 (for SIP-T27P) 
X ranges from 1 to 3 (for SIP-T23P/G) 
X ranges from 1 to 2 (for SIP-T21(P) E2) 
For programable keys: 
X=1-10, 12-14 (for SIP-T48G/T46G) 
X=1-10, 13 (for SIP-T42G/T41P) 
X=1-14 (for SIP-T29G/T27P) 
X=1-10, 14 (for SIP-T23P/T23G/T21(P) E2) 
Example: 
linekey.1.type = 5 
Default: 
For line keys: 
For 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-T23P/T23G/T21(P) E2 IP phones: