The PSTN (Public Switched Telephone Network) is the traditional, circuit-switched telephone network — the global system of physical phone lines, exchanges, and switches that has carried voice calls for over a century. It’s the “regular” phone network, as distinct from internet-based calling (VoIP), and it’s what connects landlines and, ultimately, links calls across the wider phone system.
How does PSTN (Public Switched Telephone Network) work?
The PSTN works by circuit switching: when a call is placed, a dedicated connection (circuit) is established between the two parties for the duration of the call, carrying the voice the whole time. It relies on a vast infrastructure of physical lines, telephone exchanges, and switching centers built up over decades. Modern communication increasingly runs over internet-based systems (VoIP), but the PSTN remains important — cloud voice services often need to connect to it to reach landlines and traditional phones, bridging the internet and the traditional network.
How Onextel helps with PSTN (Public Switched Telephone Network)
Onextel’s cloud voice services can connect calls to the PSTN, so businesses using modern internet-based voice can still reach any traditional phone or landline. That bridge means a business isn’t limited to internet-only calling — it can reach customers on any phone, on any network, blending modern cloud flexibility with the universal reach of the traditional network.
Why it matters
Even as communication moves to the internet, the PSTN still underpins a huge share of the world’s phone connectivity — landlines, many mobile calls, and traditional infrastructure. For a business, reaching every customer means being able to connect to the PSTN, not just internet-based endpoints. Understanding it explains how modern cloud voice still reaches the traditional phone network, and why that universal reach matters.