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Comcast phone service and Vonage both use the Internet protocol to packetize voice, and transmit the voice packets as if they were data. The key difference is that Comcast phone service operates over a private, managed digital network and Vonage operates over the public Internet. The public Internet can get congested, and this translates to delays or dropped packets. A managed private network does not have these issues - imagine that your voice data is traveling on a private road instead of a crowded freeway. This means you get the convenience and added features associated with VoIP without sacrificing call quality.
Comcast phone service also offers these additional services not provided by most Internet phone companies: