Yealink SIP-T2 Series Administrator's Manual page 311

Parameters
linekey.X.type
(x ranges from 1 to 3)
Description:
Configures a DSS key as a paging list key on the IP phone.
The digit 66 stands for the key type Paging List.
Example:
linekey.1.type = 66
Web User Interface:
DSSKey->Line Key->Type
Phone User Interface:
Menu->Features->DSS Keys->Line Key X->Type
To configure a multicast paging key via web user interface:
1. Click on DSSKey->Line Key.
2. In the desired DSS key field, select Multicast Paging from the pull-down list of Type.
3. Enter the multicast IP address and port number in the Value field.
The valid multicast IP addresses range from 224.0.0.0 to 239.255.255.255.
4. Click Confirm to accept the change.
Configuring Advanced Features
Permitted Values
66
Default
15 for line key
299