Yealink SIP-T2 SERIES Administrator's Manual page 618

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
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 a multicast paging key via web user interface:
Click on DSSKey->Line Key.
1.
In the desired DSS key field, select Multicast Paging from the pull-down list of Type.
2.
Enter the multicast IP address and port number in the Value field.
3.
The valid multicast IP addresses range from 224.0.0.0 to 239.255.255.255.
(Optional.) Enter the string that will appear on the LCD screen in the Label field.
4.
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