The idea is to use a PC running Linux, add some hardware devices to connect to some of the traditional analog phone, PC via broadband connections to the Internet and run on the software, and open source by using the method of VoIP, you can handle multiple inbound and exhale telephone exchanges have a low cost option, just a small price and low cost, can be heard the beautiful music, after connect like use the best commercial telephone switchboard, can have a call forwarding functions, and own personal voicemail (using the cost is very low),
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