“How much does a phone system cost?” has no single answer — it depends on what you need and the model you choose. But you can estimate it well if you understand what actually drives the price. Here are the factors that really matter.

What drives the cost

  • Number of extensions (users). The more employees you connect, the larger the license or subscription.
  • Simultaneous calls (channels). How many conversations happen at once — this drives sizing and, in some models, the price.
  • Enabled features. A simple IVR costs differently than a full call center with queues, wallboard, QA and recording.
  • Hosting. On-premise (on your server) or cloud — two different cost models (see below).
  • SIP trunks. Minutes and numbers from the carrier are a cost separate from the platform.

The two pricing models

Cloud (SaaS): usually a recurring monthly subscription, per user. Easy to start, but the cost grows linearly with your team and never stops — you pay for as long as you use it.

On-premise / appliance: usually you own the platform, with licensing bound to the appliance rather than an ever-growing per-user monthly fee. The upfront cost is more visible, but over time it becomes predictable.

Hidden costs to watch for

The listed price is rarely the final price. Check for:

  • Add-ons for “premium” features (recording, call center, reporting) billed separately.
  • Adjacent components — a session border controller or perimeter security, added as separate products.
  • Vendor lock-in — what it costs to leave: if your data and config are in the vendor’s format, migration becomes a cost in itself.

On-premise vs cloud, from a cost angle

The simple rule: cloud has a low entry cost and a cost over time that grows; on-premise has a more visible entry cost and a predictable cost over time, plus full control of your data. We detailed the comparison on the on-premise phone system page.

How Pentacomm thinks about price

Pentacomm uses modular licensing bound to the appliance: you start with the phone system and enable advanced capabilities (such as the call center) as you need them — without an ever-growing per-user monthly subscription. For an estimate on your concrete scenario, a proof-of-concept is the best route. See all solutions or contact us.