Multiple IP camera help

Ok my dad is clueless with anything technology related. He bought a tenvis ip camera which I setup for him without too much fuss. It's working wirelessly, static ip assigned, port forwarding in router is fine, dyndns details are in router and wan ip for dyndns is updated automatically.
Problem is bt only have one open port that's useable which is 80. He bought a second tenvis ip cam and no matter what I try it is not accessible from the outside world, only visible on his internal network. He has been speaking to a cctv firm locally and he has told me they are adament it is possible to have multiple cameras on 1 single port however I don't agree because I don't understand how it is possible. If this is possible I'd really appreciate a guide of some description of how to set up the second camera and access it using the same port the first camera is on.
Any help appreciated cheers

Its not possible unless you have a DVR controlling everything.
Simply change the second camera to port 81, and then you can access it using your hostmame like this
http://myhost.dyndns.org:81
If you can`t change the camera port, then alter the port translation so that port 81 incoming, is translated to port 80 and points to the IP address of the second camera.
Use the address above, to contact the second camera.
Another option is to use another of your DynDNS hostnames, as a webhop, and point it to http://myhost.dyndns.org:81
eg http://myhost2.dyndns.org webhops to http://myhost.dyndns.org:81
That way, you do not need to add the port number to the URL.
Camera 1 becomes http://myhost.dyndns.org
Camera 2 becomes http://myhost2.dyndns.org
There are some useful help pages here, for BT Broadband customers only, on my personal website.
BT Broadband customers - help with broadband, WiFi, networking, e-mail and phones.

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