With the help of
GrandCentral , a free service from Google, you can receive phone calls and voice messages right on your blog. Although the system is currently undergoing a period of private beta testing, you can not wait for the final ending, but
register right now.
Web Call Button
After you add a special button from GrandCentral to your blog, readers can easily call you or leave your voice message without seeing the real phone number.
You can view calls by accepting them or sending them to voice mail. In addition, it is possible to block unwanted callers altogether. You can learn how to add a call button to your blog
here (eng). As far as I understand the service (calls) is available so far only in America.
Voice mail
All voice messages are stored in a visual online inbox where you can easily manage them. Save as many messages as you like, as long as you need or post them on your blog (eng) so that everyone can hear them. Here are the posted voice messages on your blog:

via
BlogoHelp