Explore four or five voice-over IP (VoIP) providers. Make a list of costs including the setup fee, monthly cost of the basic plan, monthly cost of the unlimited plan, and cost of an adapter or other fees if required. Then make a list of attributes, such as free in-network calls, international calling, virtual telephone numbers, teleconferencing, support for caller ID, and so on. Explain how a person would use all of the quantitative and qualitative information to make an informed decision about which VoIP provider to select. Are any other variables important? Would you recommend any type of software to help compare these services?