Yealink T46G Administrator's Manual page 236

Yealink Skype for Business HD IP Phones Administrator Guide
Select the desired codec from the pull-down list of Multicast Codec.
2.
Click Confirm to accept the change.
3.
To configure two sending multicast addresses via web user interface:
Click on Directory->Multicast IP.
1.
Enter the sending multicast address and port number in the Paging Address field.
2.
Enter the label in the Label field.
3.
The label will appear on the LCD screen when sending the RTP multicast.
Click Confirm to accept the change.
4.
To configure paging list via phone user interface:
Press Menu->Features->Paging List.
1.
222