VIVOTEK FD7132 用户手册

RTSP port /RTP port for video, audio/ RTCP port for video, audio 
The 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 and the RTP port for audio is set to 5558.

■ The RTCP (Real-time Transport Control Protocol) allows the Network Camera to transmit the data by 

monitoring Internet traffic volume. By default, the RTCP port for video is set to 5557 and the RTCP port 
for audio is set to 5559.

The five ports can be changed between 1025 and 65535. The RTP port must be an even number and 
the RTCP port is RTP port number plus one, and thus always be odd. When the RTP port changes, the 
RTCP port will change accordingly.

If the RTP ports are incorrectly assigned, the following warning message will display:

Multicast settings for stream 1 / Multicast settings for stream 2: Click the items to display the detailed 
configutations. Select the Always multicast to enable multicast for stream 1 or stream 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, multicast can 
effectively save Internet bandwith.

The five ports can be changed 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 it is 
always be 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 display:

Multicast TTL [1~255]: The multicast TTL (Time to live) is the value that tells the router the range a 
packet can be forwarded.