Hello, this is Google, your operator, speaking

A Web surfer can click a phone icon adjacent to an ad, enter his or her
own phone number and then click a "connect for free" button. Google's
service calls the advertiser's phone number and when the Web surfer
picks up the receiver on his phone, he or she hears ringing as the call
to the advertiser is connected, according to a Google Click-to-Call
frequently-asked-questions page.

Unlike voice over Internet Protocol, a technology that sends voice
transmission over the Internet, this service appears to connect two
parties over the regular phone lines. However, Google declined to
provide more details, including the specifics of the technology
employed.

"We won't share your telephone number with anyone, including the
advertiser," the FAQ states. "When you're connected with the
advertiser, your number is blocked so the advertiser can't see it. In
addition, we'll delete the number from our servers after a short period
of time." .....

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