วันอาทิตย์ที่ 26 สิงหาคม พ.ศ. 2550

VoIP phones with Wi-Fi / 802.11


VoIP phones with Wi-Fi / 802.11




Wi-Fi (802.11) VoIP phones provide the same service as Ethernet VoIP phones, but they do it wirelessly.
A Wi-Fi enabled VoIP phone connects to a VoIP server or VoIP gateway through your existing Wi-Fi network.
VoIP phones with dialup modem connections
VoIP phones with dialup modem connections are very similar to VoIP phones with Ethernet connections.
Instead of connecting to an Ethernet network, these VoIP phones dialup over the PSTN to VoIP service providers.
Using a VoIP phone with a dialup modem connection requires a regular analog POTS telephone line, but enables long-distance and international calls to be made over VoIP networks, usually at a significant savings.
Software VoIP phones
Software VoIP phones turn your PC into a VoIP telephone.
Software VoIP telephones are less expensive than the choices listed above, if you already own a personal computer.
Hardware for Software VoIP phones
Software VoIP phones use the PC's sound card, speakers or earphones, and microphone. This hardware works to emulate a telephone, even though this is not what the PC was designed for.
For better ease-of-use, many companies manufacture USB VoIP phones. These devices give your PC a normal-looking telephone handset or headset.

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