User Guide SIP-T20P IP Phone
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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:
2.
Press to place the current multicast RTP session on hold.
3.
Press 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.
You can also change the behavior of how the phone handles incoming multicast paging
calls by configuring specific parameters via web user interface. The specific parameters
are: Paging Barge and Paging Priority Active.
Paging Barge
You can use the paging barge feature to define the priority of the voice call in progress.
If the priority of an incoming multicast paging call is lower than that of the active call,
then it will be ignored automatically. If Disabled is selected from the pull-down list of
Paging Barge, the voice call in progress shall take precedence over all incoming
multicast paging calls. The valid values in the Paging Barge field are:
1 to 10: Define the priority of an active call, 1 is the highest priority, 10 is the lowest
priority.
Disabled: The voice call in progress shall take precedence over all incoming
paging calls.
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.
224.5.6.20:10008
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