There are many different methods. Are they both the same type of station (i.e. digital, analog, ip, hybrid)? If so you can use the TTI method from the stations if you know the code, or log into the switch display both extensions. Write down each port. Change one station and enter X as the port number. Then change the other station and enter the first station's port number. Then go back to the first station and enter the second station's port nyumber. If they are two different types of stations, then you must physically move the cross connect to the physical jack where you want the station to be located.