Voice-over-IP phone application. Mac2Phone is the first Voice over IP phone for Mac OS X (10.2) which is working with SIP (session initiation protocol). Enjoy phone calls from mac-2-mac and very inexpensive calls to any regular phone worldwide. Be surprised by our lowest rates while calling the world. Download and usage of Mac2Phone is free, you will only be charged with our worldwide lowest rates for calling regular phones. If you want to use Mac2Phone you need to enter an valid payment information and fill up your prepaid account. You can use the complete amount for phone calls. Call the world from your Mac - SIgn up today!