How strict is your company?
If you get an IPv4 address from UPC the IP address doesn’t change very often. Now, I can’t really say what “very often” means, but my IP address definitely doesn’t change daily, most likely not weekly and maybe not even monthly.
However, if you need to provide a definite fixed IP address, then you’ll need a UPC business account.
Your company should pay the difference in UPC fees 🙂 Or you can consider using Dynamic DNS.
Ah, I see I’ve just repeated what Daniele has already said. He’s fast, as usual.