ДАВАЙ-ДАВАЙ

The default ^] telnet escape sequence is not doable on my swiss-french Macbook Pro keyboard (or at least I didn’t found how).

I defined another escape sequence by adding this to ~/.telnetrc :

# Escape sequence is <CTRL><ESC>
default
   set escape ^[

In vi, to add the code, use

<CTRL><V><CTRL><ESC>

Now, <CTRL><ESC> does the job.