does anyone know how to make IP phones work off site? I recently had Qwest install a phone system in my aurora co office, when i bought the system the salesperson told me i could use the phones off site. this was an important feature for our organization as we have 6 people that work from home offices. Now that i have the phones (cisco 7940) and i have them offsite they do not work. I called qwest and they said they will work offsite however they will not tell me how to make them work? any ideas