I bought a used NEC SL1100 phones system form a company with a similar name a while back because I wanted to have a spare system on hand for an emergency situation

The price was right although it took a long time to receive it it did finally showed up I think this was back in 2013

when I plugged it in I notice that the language for the voice mail was not US but Australia I saw in programming that I could change it back to English and that was pretty much it

I never used it until yesterday and tried to change all the langue to US English

everything seemed fine until I started to make calls in on it and when the call came in it would ring once and then stop ringing acting very weird I basically had to abort the install and get another system in there

I am just wondering if there is something different about the Hardware of programming that can be changed or corrected

Thanks

JD