•communication that allows you to make phone calls over a broadband internet connection.
•Some VoIP services require a computer or a dedicated VoIP phone
•others allow you to use your landline phone to place VoIP calls through a special adapter.

VoIP configurations
•Dedicated routers
These devices allow you to use your traditional phone to place VoIP calls.
They are connected to cable/DSL modems (or any high-speed internet source) and allow you to attach an ordinary telephone.
Once configured, and with an appropriate VoIP provider and service plan, these devices require no special software or interaction with a computer.

•Adapters (USB)
These devices also allow you to use a traditional phone to place VoIP calls.
They usually come in the form of USB adapters
They feature a standard modular phone jack to which you can attach an ordinary phone line.
Once connected, your phone behaves as if it were connected to standard phone service.

•Software-controlled VoIP applications:
There are many software applications (“softphones”) that allow you to place VoIP phone calls
Using an ordinary computer with a headset, microphone, and sound card.
Software-based VoIP applications are quite attractive to consumers
they often already have most of the components
Can start at little to no cost

•Dedicated VoIP phones
A VoIP phone looks like an ordinary corded or cordless telephone
it connects directly to a computer network rather than a traditional phone line.
may consist of a phone and base station that connects to the internet
it may also operate on a local wireless network.
Like the VoIP adapters mentioned above, dedicated VoIP phones also require a provider and service plan.

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