If you are fitting out a new office, or the old PBX in the server room has become a burden, the question is usually the same: install an IP-PBX on site, or subscribe to a cloud PBX? Both carry calls over the internet. The real difference is who owns the system, who maintains it and how it grows with your business. This article compares the two calmly, without inflated figures, so you can decide what fits your company.
The difference in one minute
- On-premise IP-PBX: a box or server installed in your office, running PBX software and connected to desk phones and your lines. You buy it, pay for installation, and your IT team or a maintenance company looks after it.
- Cloud PBX: the same functions (extensions, IVR, queues, call recording) running on the provider's servers. You manage it in the browser, agents answer from a desk phone, a computer or a mobile, and you pay a subscription per user.
The cost factors that matter
Instead of comparing a hardware quote with a monthly subscription, look at the full cost over several years.
1. Hardware and installation
An on-premise system needs a server or appliance, gateways for the lines, cabling, often a UPS and a suitable room. All of this is paid up front, before the first call. With cloud there is no server in your office: you need stable internet and good headsets, IP phones if you like, and you can start with computers only.
2. Maintenance and updates
A box on site needs constant care: security updates, backups, hardware faults and licence renewals for some software. Even a small change, such as a new extension or a new IVR message, may wait for a technician. With cloud, servers and updates are the provider's job, and day-to-day changes are yours to make from the dashboard.
3. Remote work and branches
If some staff work from home or you have a branch in another governorate, an on-premise PBX needs network settings, VPNs and open ports, which often hurt audio quality and security. Cloud is built for agents who connect from anywhere: the browser, the mobile app or the desktop app, with every branch on the same system and the same reports.
4. Scaling and seasons
On site, growth eventually hits the limits of the box and you need an upgrade. Seasonal peaks, such as Ramadan, sales events or a new real-estate launch, are hard to absorb temporarily. With cloud you add or remove users in your subscription.
5. Hidden costs
IT time, downtime during faults, power and cooling, and the difficulty of connecting the PBX to your CRM and WhatsApp. None of these show up in the quote, but all of them affect the real cost.
When on-premise can make sense
- You already have a strong IT team, servers and an internal rule that everything stays in the building.
- Internet at the site is very weak or unstable.
- Usage is simple: internal extensions only, with no plans to grow or work remotely.
When cloud is the clearer choice
- You run a call center, a sales team or customer service with real call volume.
- You have remote staff or several branches.
- You want call recording, reports and a live wallboard without an installation project.
- You want calls, WhatsApp and the customer record in one place.
Questions to ask any cloud PBX provider
- Can I connect my existing lines through a SIP trunk from my telecom provider?
- How are recordings stored, and can I keep my own backup?
- Is there a mobile app and a browser phone?
- Are IVR, queues and reports included in the system or sold as separate add-ons?
- Is the interface available in Arabic?
- Is there a free trial?
Moving from an old PBX to the cloud
- List the current extensions: who answers what and who owns each department.
- Draw the call flow: greeting, IVR menu, departments and working hours.
- Connect your lines through a SIP trunk, or ask our sales team about the numbers available for your company.
- Pilot with a small team for a week, then move the other departments.
- Keep the old PBX running until you are confident.
Klamna as your cloud PBX
Klamna's cloud PBX covers extensions, IVR, working hours, queues, call recording, hold and transfer, listen and whisper for supervisors, and a live wallboard. Agents answer from the browser, the mobile app, the desktop app or a desk phone. Because it is one platform, every call sits next to WhatsApp conversations and the customer record in the CRM. Read more about the cloud call center and call recording backup.
Try Klamna free with one team first, and decide once you have seen the difference yourself.