I think Ross may have missed the bit about different subnets. I noticed your email indicates you work at Samsung. I work at Exacq Technologies and have done alot with Samsung cameras and we use live555. My usual contact at Samsung is ByungJin Son [[email protected]].
When there is more than one subnet, there is usually a router. RTSP and live555 does Multicast or Unicast, but you still need a router. If the two subnets are in the same machine, ie 2 NICs you can put the static routes there. If "remote" means camera sits behind a firewall, then you need firewall rules to open ports to the outside world and probably NAT translation. I have personally however, done a very similar thing Live555 does with the RTSP Register command. Google "RTSP Register" Have the device (IP Camera?) reach out to a known server with the SDP packet. This starts a session thru a firewall. Just like how you can go to a website. Then the remote server passes the socket to live555 and live555 can start the normal RTSP conversation right thru the firewall. There are a few ways to do this, what exactly are you trying to do? Push video? Pull from behind a firewall? Ever heard of Sercomm, they have have an interesting protocol.
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