A USB phone works on the same principle as a regular phone but rather then having an RJ11 connector, a USB phone connects to the USB port on your computer. This allows you to use soft phones, Skype, Google Talk and other VoIP services but by using a phone rather then a microphone and loud speakers.
Advantages of a USB Phone
The main advantage of a USB phone is the ability to not use a headset or microphone and speakers. If you have used VoIP services on your computer before, you may be aware that it is often difficult to hold a conversation hands free. A USB phone brings back the good old phone but mixes it with the modern technology of VoIP. USB Phones are relatively cheap sometimes costing under $10 for a basic handset. No power is needed to run a USB phone and features such as noise cancellation, echo cancellation are standard.
How a USB Phone works
A USB phone uses a USB port on your PC or laptop. By using a USB port, no soundcard is needed. Once the USB drivers and other phone software is installed you are ready to go. Just pick up the handset and select who you want to speak to. The process is very simple.
USB Phone Adapters
A USB phone adapter allows you to use a regular phone with a VoIP service. The USB phone adapter has RJ11 ports on the side and a USB connector on the other side. It bridges the gap between a regular phone and a VoIP service. Most adapters allow you to make both regular land line calls or internet calls from the same handset.
Conclusion
VoIP has changed the way we communicate around the world. Calls are cheaper, long distance doesn’t seem so long any more. Adding a USB phone to your VoIP software on your PC makes the whole process of making a call seem normal, except you get the calls for a fraction of the price.

