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).
When the key feature is configured as Local Group,
valid values are:
0-All contacts
1-First local group
…
5-Fifth local group
…
48-Forty-eighth local group
When the key feature is configured as XML Group
(remote phone book), valid values are:
0-First XML group
1-Second XML group
…
4-Fifth XML group
Configures the channel of multicast paging group.
This parameter is only applicable to multicast paging
features.
For line keys (not applicable to SIP-T19(P) E2 IP