I can't disable echo option using apache-commons-net TelnetClient

Question

I am using apache-commons-net TelnetClient class for my telnet connection to cisco router. This code EchoOptionHandler(false, false, false, false) should disable echo-option for this connection. But it doesn't disable! Wireshark shows that router sends "will echo", then my telnet client sends "don't echo" and then router sends "won't echo". This telnet commands should mean no echoing, right? But my client receives all sent commands! How is it possible?

Answer 1

I use and works:

tc = new TelnetClient("unset localecho");