yep! basicExample is listening on port 3004 not 3000. You have to add it to the start parameter. Also you need to enable SSL at the config to work without a reverse proxy.
You can take a look at: https://hub.docker.com/r/rofl256/ezlicode/ I made this slightly changed image to run licode without this pain 
PS: I made this a few hours ago while thinking over a prototype for your other thread: Freelancer to create video chat application required But I had not much time today to do more than creating the basic container^^