Most houses and small businesses are traditionally equipped with the PSTN phone service, also called landline, and many people, especially the elders, find some difficulty in drifting away from this paradigm. And then, it is better to keep things simple while making and receiving calls, free from dependencies like a PC. Getting a VoIP line at home keeps that simplicity during use, and even allows you to make use of existing traditional phone sets.
The cost of such a service on average ranges from $10 to $25 a month, depending on the plan you choose. Different service providers tailor their service plans in a variety of ways, and you are sure to get a package that suits your needs and optimizes your cost. This is however not the least costly way of using VoIP, as there are services that are free in certain circumstances, so keep navigating through the pages for more. Also, this kind of service is common mostly in the US and Europe, and people elsewhere tend to consider other types of VoIP service.
This kind of service requires first an Internet connection, preferrably a DSL line, with sufficient bandwidth. Secondly, a special device called an ATA (also called a phone adapter) has to sit between your phone set and the DSL Internet router. The phone adapter device is shipped to you with any new subscription, so don't worry about hardware-related hassles.
Many small businesses use that kind of service, and some service providers have very good service plans for small businesses in their packages. But if your business needs more than that (including PBX services and the rest), then consider deploying a full-fledged business VoIP system.
Here are some links for your to get started with this kind of service:

