Ctrl-O doesn't work when connecting by telnet.

I have just discovered on my latest online character that I can't get ctrl-o for dungeon overview to work when connecting by telnet.
I have found the same happens on both CAO and CDO, in 0.8, 0.9 and 0.10 trunk. I would normally be connecting by ssh to CAO, but I started this game on CDO and I can't make head nor tail of the method for getting the ssh-key and using it to connect, so I'm stuck with telnet.
Anyone know of any workarounds for this?
I have found the same happens on both CAO and CDO, in 0.8, 0.9 and 0.10 trunk. I would normally be connecting by ssh to CAO, but I started this game on CDO and I can't make head nor tail of the method for getting the ssh-key and using it to connect, so I'm stuck with telnet.
Anyone know of any workarounds for this?