{"id":18455,"date":"2026-09-03T13:50:52","date_gmt":"2026-09-03T11:50:52","guid":{"rendered":"https:\/\/glofera.com\/?p=18455"},"modified":"2026-09-03T13:50:52","modified_gmt":"2026-09-03T11:50:52","slug":"voip-pbx","status":"publish","type":"post","link":"https:\/\/glofera.com\/en\/voip-pbx\/","title":{"rendered":"VoIP PBX for businesses: what it is and how it works"},"content":{"rendered":"

You’ve been told your phone system needs to switch to VoIP, and if you’re lucky, someone threw three more acronyms at you to explain it. This article does the opposite: understanding what a VoIP PBX does under the hood, what you need for it to work well, and what questions to ask when someone hands you a quote.<\/p>\n

What a VoIP PBX actually is<\/h2>\n

VoIP stands for Voice over IP<\/em>: voice over the internet protocol. A VoIP PBX is the system that handles your company’s calls by converting your voice into data packets and sending them over the network, instead of over the copper pair of a traditional phone line.<\/p>\n

Put simply: it’s the same PBX as always \u2014 extensions, transfers, greetings, queues \u2014 but running over your internet connection instead of over a metal box hanging on the wall of the utility room.<\/p>\n

The practical difference isn’t technological, it’s about flexibility. Adding an extension on an analog PBX meant running cable. On VoIP it’s a two-minute configuration change.<\/p>\n

\"Free<\/span><\/div><\/div><\/div>

<\/span><\/p>\n

Analizamos GRATIS<\/strong> las llamadas de tu empresa<\/span><\/p><\/h4><\/div>

REQUEST A CONSULTATION<\/span><\/a><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div>\n<\/p>\n

The real journey of a VoIP call<\/h2>\n

When a customer calls your company, here’s what happens between the ring and someone answering:<\/p>\n

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  1. The call enters the carrier’s network.<\/strong> If the customer is calling from a mobile or a traditional landline, their voice travels as usual to the point where your VoIP provider picks it up.<\/li>\n
  2. It gets converted into data.<\/strong> A codec \u2014 usually G.711 or Opus \u2014 digitizes and compresses the audio signal into very small packets, roughly 20 milliseconds each.<\/li>\n
  3. The SIP protocol decides whose phone rings.<\/strong> SIP is the “language” the PBX uses to set up calls. This is where your rules kick in: schedule, IVR, queue, ring group, overflow.<\/li>\n
  4. The packets reach your device.<\/strong> An IP phone, the mobile app, or the computer softphone receives the audio stream and converts it back into sound.<\/li>\n
  5. Everything gets logged.<\/strong> Who called, at what time, how long it lasted, who picked it up, and whether it went unanswered. That log is the part companies coming from an old PBX miss the most.<\/li>\n<\/ol>\n

    All of that happens in under half a second. And here’s what matters to you: steps 3 and 5 are the ones that stop being locked in a box in your office and become configurable software.<\/p>\n

    What you actually need for it to work<\/h2>\n

    Bandwidth: the calculation almost nobody does for you<\/h3>\n

    A VoIP call with the G.711 codec uses around 100 kbps per direction<\/strong>, including protocol overhead. With more efficient codecs, it drops quite a bit. Translated to your office: ten simultaneous calls need around 1 Mbps of dedicated upload.<\/p>\n

    Any current business fiber connection covers that without blinking. The problem is never the amount of bandwidth, it’s who’s eating it up<\/strong>: a cloud backup kicking off at eleven in the morning or a whole team on a video call can degrade voice quality even if your bandwidth meter says you’ve got plenty to spare. That’s why it matters to prioritize voice traffic on the router (QoS), not buy more megabits.<\/p>\n

    Devices: you don’t have to throw anything away<\/h3>\n

    There are three ways to talk on a VoIP PBX, and they can be mixed within the same company:<\/p>\n