Simple VoIP requires very little equipment. More advanced communication Voice over IP requires more sophisticated equipment. What is the equipment for VoIP?
Common VoIP Hardware Devices IP Phones - Special Phones for VoIP What is an ATA? What The Lights On Your Phone Adapter (ATA) Mean What is a Router? - The Functions of a PBX Vendor-Provided Equipment

Getting the Most out of VoIP!
Here are some things you need to know to be able to make your VoIP experience as great as possible. These include materials and equipment, tips and tricks, security and some other things. VoIP can also handles voice, but also video and data. Here are your resources.
Requirements and Setting Up | VoIP | Equipment/Hardware | Tips And How To's | VoIP Security | Faxing over IP | Recording Your Calls