NEC has a site for the SL1100(
www.necSL1100.com). On the home page, Product Information tab there is a selection for resources. On that page there are a number of video tutorials - as well as a link to register for documentation and technical support from NTAC.
I am just getting ready to get my first system, so I don't have hands on, but it looks to program very similar to UX5000 or SV8100 if you have experience with either of those. It seems to be a very scaled down version of the aforementioned systems.
If I had to guess - I would say try 700 as the Inmail pilot number. And use the last ports available on the system as the port #s. Just a guess - good luck, I hope it goes well.
Remember, all this simple technology and extremely high pay is why we all got into this business - not to mention the patient customers. :rofl: