With Topcom Butler 4812 VoIP program, you can make and receive calls over the Internet, provided you have an Internet connection and one of the following programs installed: Support Skype, MSN, Net2Phone, Sj-Phone, VoIPBuster, Netappel, VoIPStunt, VoIPdiscount, SipDiscount, Poivy, VoIPCheap, Internetcalls, and SparVoIP.
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