For the programable key, the default value is not
applicable.
For the line key, when X=1, the default value is
1.
When X=2, the default value is 2.
When X=3 the default value is 3
…
When X=16 the default value is 16.
Permitted Values:
1 to 16 (for SIP-T48G/T46G/T29G)
1 to 12 (for SIP-T42G)
1 to 6 (for SIP-T41P/T27P)
1 to 3 (for SIP-T23P/G)
1 to 2 (for SIP-T21(P) E2)
1-Line 1
2-Line 2
…
16-Line 16
Configures the value for some key features.
For line keys:
X ranges from 1 to 29 (for SIP-T48G).
X ranges from 1 to 27 (for SIP-T46G/T29G).