D-Link DCS-5220 User Manual page 41

Section 3 - Configuration
The port number that you use for RSTP streaming, the default port number is 554. RTP (Real Time Protocol) Port is used
RTSP port:
to streaming audio and video while RTCP (Real Time Control Protocol) port is used to monitor QoS of RTP stream.
Note: RTP video port and RTP audio port must be an "even" number. The numbers of RTCP video port and RTCP audio
port must equal to the numbers of RTP video port and RTP audio port, plus one repetitively.
Default port number is 5556.
RTP port for video:
RTCP port for
Default port number is 5557.
video:
Multicast group
You may choose to enable multicast for your camera audio and video streaming so that your cameras (sources) and the
address:
receivers (clients) can establish the connection to send and receive contents.
An IP Multicast group address is used to send and receive content. Sources use this group address as the destination
address while sending their data packets. Receivers use this group address to inform the network that they are interested
in receiving packets sent to that group.
D-Link DCS-5220 User Manual 41