How 3CX Licensing Works: Simultaneous Calls, Not Seats
Most cloud phone systems charge per user, per month: 50 employees means 50 seats, even if 30 of them are part-time. 3CX licenses by simultaneous calls instead, so you size for peak usage. If you typically have 8 calls happening at once, you license for 8 simultaneous calls, not 50 seats. That’s why 3CX is a cost-effective choice for most SMBs: you can add staff without paying more, as long as your peak call volume stays the same.
You don't overpay for part-time users
Pay for calls happening at once, not every headcount.
Add users without upgrading your license
Only step up when peak concurrent calls actually rise.
Scale down without penalty
If usage drops, the licence can come down too.
Typically cheaper than per-seat UCaaS
Especially for teams with occasional or part-time phone use.
OpenAI
Grok
GoogleHow to Size a 3CX License: 4SC, 8SC, 16SC and Up
3CX licenses are sold by simultaneous calls, often shortened to “SC.” A 4SC license handles up to four calls at the same time, 8SC handles eight, and 16SC handles sixteen, with larger sizes for bigger teams. If you have 50 employees but only 5 are ever on calls at once, you need a 4SC or 8SC license, not 50 seats. To size it, count the most calls happening at once during your busiest hour and add room for growth. RingOffice does this sizing with you so you don’t over or under buy.
Small office (5–10 staff)
Usually a 4SC license.
Growing SMB (20–50 staff)
Typically an 8SC or 16SC license.
Mid-market (50–150 staff)
Often 16SC to 32SC.
Larger / multi-site
Sized to peak demand across locations. RingOffice scopes it for you.
3CX Pro vs AI Edition: Which License Fits?
3CX offers several editions. RingOffice provides the ones built for a managed cloud service, sized to your simultaneous calls.
Buy 3CX Licensing Through a Titanium Partner, Included in Your Plan
Looking to buy a 3CX license? With RingOffice, you don’t need to buy, register, or renew a license key yourself. Buying 3CX licensing on your own means sizing simultaneous calls, picking an edition, tracking renewals, and planning upgrades. RingOffice does all of it: we size the right license, include it in your managed plan, run it on North American cloud, and handle upgrades with zero downtime as your usage changes. And because you’re on a managed plan, the AI layer runs on the engine you choose, not a single locked-in vendor.
Sizing and edition selection done for you
RingOffice scopes your peak simultaneous calls and the right edition.
Licensing included in your managed plan
No separate licence to buy, track or renew.
Upgrades handled with zero downtime
Step up (or down) as your usage changes, managed by RingOffice.
3CX Pricing and Licensing in 2026
A few changes worth understanding. RingOffice plans around all of them, so there are no surprises.
Get the Right 3CX License, Managed by RingOffice
Tell us your team size and how busy your phones get, and RingOffice will size the right 3CX license, include it in a managed plan, and show you exactly what it costs.
3CX Licensing and Pricing FAQs
What teams ask when sizing and buying a 3CX-based phone system.