In 5.5 there was an option to enable telnet, in 5.6 that option is no longer there. Mitel was urging the use of ssh and scp at that time. But if you run these commands, it should enable you to telnet using root as long as you are on the local network.
/sbin/e-smith/config settype telnet service
/sbin/e-smith/config setprop telnet status enabled
/sbin/e-smith/config setprop telnet PermitRootLogin yes
/sbin/e-smith/config setprop telnet access private
/sbin/e-smith/expand-template /etc/xinetd.conf
you should now see in /etc/xinetd.conf a line for telnet
/sbin/e-smith/expand-template /etc/hosts.allow
/etc/rc.d/init.d/xinetd restart
I just did this on my 6.0 box and it worked for me.
Good Luck,
JB