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The WebRTC and SIP technologies won't replace anything legacy for VoIP infrastructure. They assume to work with a real-time peer to peer video and voice communication. Google Hangouts offers calls, SMS, video conferencing, and informing ability all inside the program. SIP calling API and SDK allows you to receive calls and control VoIP/SIP calls across phone devices and using third-party platforms. The power of voip calling API & sdk technologies, SIP calls quickly integrate with the overall solution.