telephone equipment

Depends, you'd need to provide more information about your current setup. Is it old phones or a voip system. do you have a local voip server or a pbx of some kind. Is your phone service through comcast etc... There are some issues with getting a voip system working with outside access but generally you should be okay. Allot of tech companies will do free surveys. If you don't have static IPs and are using a voip system I would suggest getting your own modem and router. You'll have less issues