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VIVOTEK
User's Manual - 45
RTSP port /RTP port for video/ RTCP port for video
■ RTSP (Real-Time Streaming Protocol) controls the delivery of streaming media. By default, the port
number is set to 554�
■ The RTP (Real-time Transport Protocol) is used to deliver video data to the clients. By default, the RTP
port for video is set to 5556�
■ The RTCP (Real-time Transport Control Protocol) allows the Network Camera to transmit the data by
monitoring the Internet trafc volume. By default, the RTCP port for video is set to 5557.
The ports can be changed to values between 1025 and 65535� The RTP port must be an even number
and the RTCP port is the RTP port number plus one, and thus is always an odd number� When the RTP
port changes, the RTCP port will change accordingly�
If the RTP ports are incorrectly assigned, the following warning message will be displayed:
Multicast settings for stream 1 ~ 2: Click the items to display the detailed configuration information�
Select the Always multicast option to enable multicast for stream 1 ~ 2�
Unicast video transmission delivers a stream through point-to-point transmission; multicast, on the other
hand, sends a stream to the multicast group address and allows multiple clients to acquire the stream at
the same time by requesting a copy from the multicast group address� Therefore, enabling multicast can
effectively save Internet bandwith�
The ports can be changed to values between 1025 and 65535� The multicast RTP port must be an even
number and the multicast RTCP port number is the multicast RTP port number plus one, and thus is
always odd� When the multicast RTP port changes, the multicast RTCP port will change accordingly�
If the multicast RTP video ports are incorrectly assigned, the following warning message will be
displayed:
Multicast TTL [1~255]: The multicast TTL (Time To Live) is the value that tells the router the range a
packet can be forwarded�