Voice over Wi-Fi

Wi-Fi phones are cordless telephones that communicate with Wi-Fi access points or hot spots and VoIP to send and receive calls through the Internet. When you combine a VoIP telephone instrument and a VoIP account with a Wi-Fi network, you can create a telephone connection that does not require a dedicated telephone line or cellular telephone account. You also get a truly ugly abbreviation: either VoWiFi or wVoIP, depending on where you look.

Most VoIP services use the Session Initiation Protocol (SIP) specification to control Internet telephone calls and other multimedia services. SIP is comparable to the Hypertext Transfer Protocol (HTTP) that controls the World Wide Web. A VoWiFi telephone must either support SIP or connect to ...

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