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Hardware device is required for dialing or receiving calls using Voice over IP (VoIP) which allows you to listen and speak. You might need a complete set of network equipment, including routers and phone adapters or simply a headset with your PC. The equipment or accessories that can be used with the Voice over IP telephony services other than the regular devices like computers, modems etc.

Voice over IP Gateways

VoIP Gateway or Voice over IP Gateway is a network device, which is used to convert voice and fax calls between the PSTN (Public Switched Telephone Network) and an IP network in real-time. Most of the VoIP gateway features at least one telephone port and one Ethernet port. The main function of Voice over IP gateway includes fax and voice decompression/compression, call signaling, packetization and call routing.

A modem is a short name for modulator-demodulator. It is a program or device that modulates (encode) the digital information to analog form, and also demodulates (decode) the signal to produce the original transmitted information. In simple words, it is a device that enables computer to transmit data over the telephone lines. Speed of modem is generally measured in Mbps (Megabits per second) and Kbps (Kilobits per second).

VoIP Telephone is a piece of hardware which look similar to home telephone or cordless phone, which can be used to make voice or video calls through internet. These phones use VoIP technology similar to online faxing services rather than the traditional PSTN telephone line which works on internet protocols such as SIP (Session Initiation Protocol), SCCP (Skinny Client Control Protocol) or one among the various proprietary protocols associated with the provider.