The audio signals are analog in nature which are first converted into digital data packets and then are transmitted over the high speed broadband network. At the receiving side, the digital signals are again converted back into analog voice signals. IP PBX calls can be made in 3 ways:
Via ATA – It is the simplest and easiest way to make VoIP PBX calls. ATA is an analog to digital converter, which allows you to connect your standard phone to your internet connection to use VoIP PBX. It converts speech signals into digital data to be transmitted over the internet.
Via IP Phone – These are specialized phones that look just like normal phones, with a handset, buttons, and cradle. But IP phones use RJ-45 Ethernet connectors instead of standard RJ-11 phone connectors. They have all the hardware and software on board to connect your phone directly to the broadband network to make IP PBX calls.
Via Computer to Computer – This is certainly the cheapest and easiest way to make business PBX calls. Several hosted PBX service providers offer low-cost services and software for this type of PBX system. Microphone, speaker and high-speed internet connection is all you need, and you are ready to make calls.