Contact Center VoIP Provider. Switch2VoIP is a Business VoIP phone service provider that allows your Contact Center agents to start making phone calls instantly and save money while enjoying the best phone service provider. Let Switch2VoIP manage your call center or business VoIP needs with accuracy and reliability so you can focus on your core business with peace of mind! Switch2VoIP.us has been serving call-centers, large business and residential VoIP customers in 55 countries since 2006. Our A-Z VoIP Termination manages billions of calls every year with 99.999% accuracy.