Yealink SIP-T48G - Manual (Page 146)

User Guide for the SIP-T48G IP Phone
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The valid multicast IP addresses range from 224.0.0.0 to 239.255.255.255.
9. Tap the Save soft key to accept the change or to cancel.
10. Tap the DSS Key key to return to the idle screen.
Multicast paging key is configurable via web user interface at the path DSSKey->Line
Key.
You can also configure the phone to use a default codec for sending multicast RTP
stream via web user interface.
To configure a default 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.
The default codec is G722.