Yealink SIP-T2 Series Administrator's Manual page 706

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860 IP Phones
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.
Select the desired channel from the pull-down list Channel.
4.
680