Vivotek 3GPP - Manual (Page 6)

Project code management 2006
5 Confidential
It is also feasible to install multiple 3GPP network cameras behind one IP router.
Each camera should use a different set of ports. For example:
Camera 1: HTTP port (8080), RTSP port (1554), RTP/RTCP video port
(8000/8001), RTP/RTCP audio port (8002/8003)
Camera 2: HTTP port (8081), RTSP port (1555), RTP/RTCP video port
(8004/8005), RTP/RTCP audio port (8006/8007)
Camera 3: HTTP port (8082), RTSP port (1556), RTP/RTCP video port
(8008/8009), RTP/RTCP audio port (8010/8011)
Note that each camera has different ports from each other. This is because all
these ports need to be open in the router.
This way, each camera will share the same public IP and you can access each
one by different port number. For example: if the domain name of the IP router is
livecam.VIVOTEK.com, the URL of each camera for handset to input would be
Camera 1: rtsp://livecam.VIVOTEK.com: 1554 /live.sdp
Camera 2: rtsp://livecam.VIVOTEK.com: 1556 /live.sdp
Camera 3: rtsp://livecam.VIVOTEK.com: 1556 /live.sdp
From above, all we want to know is RTSP port to obtain a valid URL to access each
camera
When “Enable UPnP port forwarding” is checked, camera will automatically
communicate with router and assign necessary ports by itself except HTTP port.
HTTP port need to assign by user otherwise camera can not be accessed once
HTTP port is random assigned. All that user need to do is assign HTTP port for each
camera and check “Enable UPnP port forwarding”. Again, you have to choose
different HTTP port for each of your camera if you are installing multiple ones and
camera will take care of rest of the ports for you. After all the cameras are installed,
user can then obtain the assigned RTSP port.