Cisco 8020 Reference Manual page 65

Chapter 5 Configuration
2.
3.
4.
RTSP port /RTP port for video, audio/ RTCP port for video, audio:
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–
–
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The ports can be changed to values through 1025 to 65535 (for RTSP port) or 1026 to 65534 for
(RTP port). 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.
Invalid port number. RTP video port must be an even number.
Multicast settings for streams—Click the items to display the detailed configuration information.
•
Select the Always multicast option to enable multicast for video streams.
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:
Invalid port number. Multicast stream 1 video port must be an even number.
Multicast TTL [1~255]—The multicast TTL (Time To Live) is the value that tells the router the
•
range a packet can be forwarded.
Initial TTL
0
1
32
64
128
255
Choose File > Open URL. A URL dialog box will pop up.
Type the above URL command in the text box.
The live video will be displayed in your player.
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 and audio data to the clients.
By default, the RTP port for video is set to 5556.
The RTCP (Real-time Transport Control Protocol) allows the camera to transmit the data by
monitoring the Internet traffic volume. By default, the RTCP port for video is set to 5557.
Scope
Restricted to the same host
Restricted to the same subnetwork
Restricted to the same site
Restricted to the same region
Restricted to the same continent
Unrestricted in scope
Cisco Video Surveillance 8020/8030 IP Camera Reference Guide
Network > Streaming protocols
5-23