Telecoms glossary • S
Softphone
Included with most subscriptions, and roughly as good as the headset and the machine you run it on.
What is a softphone?in VoIP and business telephony
1. A softphone is an application that registers as an extension of your phone system on a computer, tablet or smartphone. It places and answers calls over the internet using the same SIP account a desk phone would use, so the user keeps one number, the company caller ID and the full feature set with no handset on the desk.
2. Two forms exist: an application you install, and a browser tab built on WebRTC. Both are ordinary extensions as far as the phone system is concerned, and both consume a licence in the same way.
How a softphone becomes an extension
Nothing about the phone system changes. The application performs the same registration a desk phone performs, using credentials issued against an extension.
You sign in, the client sends a SIP REGISTER to the provider, and from that moment the extension is reachable on that device. Provider-branded clients usually provision themselves from an account login rather than asking for a server address, which is the practical difference between a supported client and a generic one.
On a mobile, incoming calls normally arrive through the operating system’s push notification service rather than by keeping a socket open. Euphoria’s iOS client documents exactly that approach, using push to signal incoming calls and preserve battery. It matters because a mobile softphone that is stopped by the operating system’s battery optimiser will simply not ring, and the user will report it as a fault on the phone system.
Audio quality is handled by the device. Echo cancellation, microphone gain and noise suppression are software running on a machine that is also compiling a spreadsheet, which is the honest reason desk phones still sell.
Softphone or desk phone
Both are extensions with identical features. The difference is operational, and the row that decides it is rarely the one people argue about.
| Softphone | Desk phone | |
|---|---|---|
| Hardware to buy | None | One per user |
| Time to deploy | A login | Provisioning and cabling |
| Works away from the office | Anywhere with data | Needs the phone shipped there |
| Audio consistency | Depends on the headset and the machine | Dedicated hardware, same every day |
| Reception and busy-lamp keys | On screen, slower under pressure | Physical keys, glanceable |
| Survives a computer problem | No | Yes, it is a separate device |
| Power interruption behaviour | Laptop or mobile battery | Needs PoE and a UPS |
Most South African offices end up with both, and not as a compromise. Desk phones sit where people take calls all day, softphones cover everyone else, and the mobile client is what keeps the line answered when the office network is unavailable. Our comparison of desk phones, softphones and mobile apps works through the split by role.
What South African providers actually ship
Provider-branded clients are the norm rather than the exception. Euphoria ships a client named, plainly enough, Euphoria Softphone & TMS, which registers as an extension of its Cloud PBX and pulls call history from the management system. Telviva publishes Telviva Mobile with its own user guide. 3CX, widely deployed locally, publishes clients for Windows, Android, iOS and the browser.
The practical consequence is that a softphone is rarely a separate purchase decision. It arrives with the platform, which means the questions worth asking are about feature parity rather than price: does the client do call recording, queue login, transfer and presence, or is it a dialler with a contact list attached. Our roundup of the softphones most used in South Africa compares the clients themselves.
One local wrinkle is worth planning for. A mobile softphone on a data bundle keeps a business reachable when the office connection or power is down, but the same client on an unmanaged home Wi-Fi network is the hardest thing in your estate to troubleshoot, because you cannot see the network it is failing on.
Getting decent audio out of one
Four things account for nearly every complaint about softphone quality. Use a proper USB or DECT headset rather than the laptop’s built-in microphone, because the built-in array is tuned for meetings and picks up the room. Prefer a cabled connection to Wi-Fi where there is a choice. Stop the machine sleeping mid-shift. On mobile, exclude the client from battery optimisation so it can still receive a push and ring.
When you compare a softphone with a desk phone, compare like for like: a good headset on a wired laptop is close to indistinguishable from a mid-range desk phone. A built-in microphone on hotel Wi-Fi is not, and no phone system setting will close that gap.
About this entry
Definitions are written for South African business buyers and checked against primary sources – provider documentation, standards bodies and ICASA – not vendor marketing. Reviews are independent and sponsors are always disclosed. Read our editorial policy and scoring methodology.
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