For a VoIP system to work, it needs a means of routing calls between users or to the outside world. In a cloud based system, a virtual PBX does that job. What that means to you is that the provider is running a large PBX operation in a data center somewhere, and slicing off a little of it to dedicate to your organization in exchange for your money. You're essentially sharing a large PBX with that provider's other customers, but because these companies use multi-tenant segmentation, your PBX will appear dedicated to you. This engine will take care of routing calls on your VoIP network.
An IP phone or VoIP Adapter (ATA) – You’ll see a wide range of prices between the different providers when it comes to equipment. Some providers have expensive equipment and “freemium” service; others will lease you equipment for free and charge more per month. Between those two, you have a lot of in-between. An IP phone plugs directly into your modem or router, and an ATA lets you use a legacy phone over the VoIP network. You need an IP phone to truly enjoy all the benefits of VoIP calling, which is why VoIP phones are becoming more popular.
Know How To Hook Up Multiple Phones – Most houses are wired in such a way that you can connect POTS phones throughout the house. But, you’ll also want to consider different options. You may have IP phones connected to Ethernet jacks in different rooms; you may want to use a wireless phone with many handsets; you might even opt for using mobile apps over your home’s Wi-Fi.
The technical details of many VoIP protocols create challenges in routing VoIP traffic through firewalls and network address translators, used to interconnect to transit networks or the Internet. Private session border controllers are often employed to enable VoIP calls to and from protected networks. Other methods to traverse NAT devices involve assistive protocols such as STUN and Interactive Connectivity Establishment (ICE).
Yes it is really this simple. Just connect your telephone adapter to your home Internet by connecting a cable between it and your router or modem. Then connect your existing phone to the adapter and you should be good to go. If you decided to use your own adapter, you will likely be required to run a quick configuration script that is supplied by your service provider.