How to setup a ssh tunnel for telnet with openssh?

Ok, I know, it could be done easier in another way. But I want to setup explicitely a
telnet connection from a client to a server.

By default the connection is NOT using a VPN. So I want to use an openssh tunnel (just for this teh telnet
application). How do I enter exactly the ssh resp. sshd command strings (inclunding the port forwarding flags)?

Peter