Yealink SIP-T48G - Manual (Page 147)

Advanced Phone Features
137
3. Click Confirm to accept the change.
Note
To send RTP stream:
1. Tap the multicast paging key when the phone is idle.
The phone sends RTP to a preconfigured multicast address (IP: Port). Any phone
configured to listen to the multicast address may automatically answer the paging
call and play receiving RTP. For more information on how to configured a phone to
listen to a multicast, refer to
Receiving RTP Stream on page 137 . For both sending
and receiving of the multicast RTP, there is no SIP signaling involved.
The multicast paging key illuminates solid green.
The following figure shows a multicast RTP session on the phone:
2. Tap the Hold soft key to place the current multicast RTP session on hold.
3. Tap the End Call soft key to cancel the multicast RTP session.
Note
You can configure the phone to receive a Real Time Transport Protocol (RTP) stream from
the pre-configured multicast address(es) without involving SIP signaling. You can
specify up to 10 multicast addresses that the phone listens to on the network.
How the phone handles incoming multicast paging calls depends on Paging Barge and
Paging Priority Active parameters configured via web user interface.
If G722 codec is used for multicast paging, the touch screen displays the icon to
indicate that is providing high definition voice.
Default codec for multicast paging is configurable via web user interface only.
Multicast RTP is one way only from sender to the multicast address(es) (receiver). For
outgoing RTP multicasts, all other existing calls on the phone will be placed on hold.