Specifications

User Guide SIP-T28P IP Phone
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5. Enter the multicast IP address and port number (e.g. 224.5.6.20:10008) in the Value
field.
6. Press the Save soft key to accept the change or the Back soft key to cancel.
You can also configure a multicast paging key via web user interface at the path
Phone->DSS Keys.
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 Phone->Features ->General Information>>.
2. Select the desired codec from the pull-down list of Multicast Codec.
3. Click Confirm to accept the change.
Note
To send RTP stream:
1. Press the multicast paging key when the phone is idle.
The phone sends RTP to a preconfigured multicast address (IP: Port). Any phone in
the local network then listens to the RTP on the preconfigured multicast address (IP:
Port). For both sending and receiving of the multicast RTP there is no sip signaling
involved.
The multicast paging key LED illuminates solid green.
The following figure shows a multicast RTP session on the phone:
If G722 codec is used for multicast paging, the phone LCD screen displays icon to
indicate that is providing high definition voice.