Your existing incoming high-speed Internet connection should be sufficient but the higher the connectivity the better the signal. In terms of hardware, you can hook up an inexpensive microphone to your computer or connect a phone directly to a VoIP telephone adaptor (ATA). Or you can use a phone specially made to work with Internet Voice. This is called an SIP phone. Each SIP phone is a network endpoint, and voice is routed via its IP address. It allows a DID (direct inward dialing) number to move with a user. You can move, add or remove stations and never have to call your interconnect/PBX service company. SIP phones also allow full use of advanced features like voice mail to e-mail and auto attendant.
4. Are there any differences between making a local call or a long distance call?
There are many different calling available for VoIP. The calling rates and fixed plans will vary from one vendor to another depending on the service you select. Please make sure to read all of the fine print associated with any plan that you choose. One thing to keep in mind, however, is that VoIP can blur the difference between local and long distance by issuing a local number for your Internet phone. This allows you to make LOCAL calls to your home area code from that phone, regardless of where you are geographically. All you need is an Internet connection to plug in your phone, it doesn't matter what Internet provider you use, and you can call your local area code from anywhere in the world without paying long distance rates.