SmokeSignal SiteFlag and Internet Call Manager

You really need this if you only have one telephone line. Don't Miss Incoming Calls.
Internet Call Manager from InfoInterActive. ICM is a clever bit of software that solves a common problem: Surfing the Net ties up your phone line. You don't want to miss urgent phone calls, but you don't want to pay for a second phone line. Internet Call Manager is a cheap solution.