Yealink SIP-T2 SERIES Administrator's Manual page 621

Parameters
For ext keys:
X ranges from 1 to 6, Y ranges from 1 to 20, 22 to 40 (Ext key 21 cannot be
configured).
Web User Interface:
DSSKey->Line Key/Programable Key->Label
Phone User Interface:
Menu->Features->DSS Keys->Line Key X->Label
To configure a codec for multicast paging via web user interface:
1. Click on Features->General Information.
2. Select the desired codec from the pull-down list of Multicast Codec.
3. Click Confirm to accept the change.
To configure two sending multicast addresses via web user interface:
1. Click on Directory->Multicast IP.
2. Enter the sending multicast address and port number in the Paging Address field.
3. Enter the label in the Label field.
Configuring Advanced Features
Permitted Values Default
599