Telnet to my cisco router from outside.

i have this configuration on my cisco router in a nut shell i can telnet router on lan but not from outside i dont know which command in this preventing me to telnet from outside.

line 2
no activation-character
no exec
transport preferred none
transport input all
transport output pad telnet rlogin lapb-ta mop udptn v120 ssh
stopbits 1
line vty 0
password cisco
login
transport input telnet
line vty 1
password cisco
login
transport input telnet
transport output none
line vty 2 4
exec-timeout 0 0
password cisco
login
transport input telnet
transport output none
line vty 5 15
no login
transport input all
!
scheduler allocate 20000 1000
end

also what does these commands means

transport input none.

tranport preferred none.

transport output ssh.