using nc to simulate a service

I am trying to set up Hylafax to serve up polled documents.
Problem is, all my research indicates Hylafax does not support this feature.

So, now I have two problems:
1. Hylafax' lack of support
2. Cox' filtering of incoming ports.

So, what I think I need is to run netcat (nc) to listen
on some oscure port. What I would like to do is this:

If I was to 'telnet myfaxserver <obscure_port> parameter'

Once it hits the port, it will run a perl script and
pass it the parameter.

I am tired, and I am sure there is an easier way...
any suggestions?

v/r
-mike