[Freeswitch-users] only port 8040 works for outbound esl connection?

I have posted a challenge I was having with outbound esl connection. I was using port 8022 because that was what is in the source of node-esl. Adam Kelloway suggested freeswitch is listening on that port but freeswitch listens on 8021. But I decided to change the port anyway it did not work. I then decided to change it to port 8040 like in the book and it worked. I tried other ports but they did not work. My question, is there anything that says freeswitch must only send outbound esl connection to only port 8040 and nothing else? Regards