Yealink EXP40 - Manual (Page 39)

Configuration
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If you leave this field blank, the LCD screen will display the default label “LDAP”.
4. Click Confirm to accept the change.
You can use multicast paging to quickly and easily announce time sensitive
announcements to people within the multicast group. You can configure a multicast
paging key on the phone, which allows you to send a Real Time Transport Protocol (RTP)
stream to the pre-configured multicast address(es) without involving SIP signaling.
To configure a DSS key as the multicast paging key:
1. Click on DSSKey->Ext Key.
2. In the desired DSS key field, select 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. Enter the desired value in the Label field or leave it blank.