What is a network calling card?

Internet phone, also known as VOIP phone, is a direct call to the other party's fixed phone and mobile phone through the Internet, including domestic and international long-distance calls. The tariff is 65438+ 00% to 20% of the traditional phone bill. Macroscopically, it can be divided into software mobile phones and hardware mobile phones. Software phone is to download software from a computer, then buy a network phone card, and then talk to the other party (fixed line or mobile phone) through headphones; Hardware telephone is more suitable for companies, telephone bars and so on. First, you need a voice gateway. One side of the gateway is connected to the router, and the other side is connected to the ordinary telephone, and then the ordinary telephone can be freely called out directly through the network. The KC I only use is relatively stable and the sound quality is good.