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You can't do this without a "call waiting" modem. You can look into possibly subscribing to one of the "Internet call waiting" services, but by the time you pay them and pay the phone company for "forward call busy" service, you won't be saving anything.
I do not have voice mail, but I do have standard call forwarding. I forward my phone to my cell phone when I go online, and it has caller ID and voice mail as part of the package.
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