Yealink SIP-T2 SERIES Administrator's Manual page 979

Format
Default Value
Range
Example
SIP-T48G/T46G/T29G/T27P IP phones):
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
Integer
0
0 to 48
Configures the second remote phone book.
linekey.1.xml_phonebook = 1
Appendix
957