Google Voice is set to launch, marking a milestone in telephony with its demonstration of innovation in the phone industry 130 years after the first telephone call. The service will integrate tightly with the web and traditional phone network, offering benefits such as user-defined logic for routing calls. While Google Voice itself isn't explicitly extensible, users can route their Twilio calls to and from their Google Voice account, allowing them to add complex routing functions. Twilio also offers the necessary building blocks to create a mini-Google Voice service with features like inbound/outbound calling, keypad input, call screening, voicemail recording, and speech-to-text transcription.