Wholesale eSIM for PBX extensions
Your PBX extension, on any phone.
As an eSIM.
Connect a SIP extension from your PBX — 3CX or any SIP-compatible system — and hand your customer a mobile line that just works. No softphone, no app: a real eSIM their phone already understands.
Invitation-only onboarding for wholesale accounts, MSPs and PBX resellers.
How it works
Three steps, from your PBX to a working eSIM.
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01
Add your SIP extension
Enter the extension's host, port, transport (UDP/TCP/TLS), user and password from your PBX — 3CX or any SIP-compatible system.
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02
Test the connection
esim2sip performs a real SIP registration test against your PBX before provisioning anything, so you know it works.
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03
Scan the eSIM QR
Scan the eSIM QR code with the phone. It registers instantly and the extension is now reachable as a mobile line, both ways.
Everything you need to resell mobile lines
Built for wholesale, from day one.
Works with 3CX and any SIP PBX
No proprietary integration. If it speaks SIP, esim2sip can register an extension for it.
TLS-secured signaling
Connect over UDP, TCP or TLS. Credentials are encrypted at rest, always.
Real two-way calls
The mobile line isn't a forwarding trick — it's a genuine registration, so calls flow both ways.
No app to install
The line arrives as a standard eSIM. Any phone with eSIM support just works.
Wholesale accounts, with sub-companies
One master account per reseller, unlimited companies underneath for each of your own customers.
Per-line monthly pricing
Simple, predictable pricing per line per month, billed to your account.
Built for MSPs, ITSPs and PBX resellers
If you already manage PBX deployments for your customers, esim2sip lets you offer them a mobile line for every extension — under your own wholesale account, at your own pricing.
- Managed Service Providers extending PBX offerings
- ITSPs adding a mobile product line
- 3CX and PBX resellers/integrators
- Any wholesale account with multiple end-customers
Frequently asked questions
Do I need to install an app on the phone?
No. The extension arrives as a standard eSIM QR code. Scan it once in the phone's built-in eSIM settings and the line is active — no softphone or third-party app required.
Which PBX systems are supported?
Any PBX or SIP-compatible system that can expose a standard SIP extension, including 3CX. esim2sip registers to it over UDP, TCP or TLS, the same way a SIP phone would.
How is pricing structured?
Wholesale, per line per month, billed monthly to your master account. Each account can have multiple companies underneath it for your own end-customers.
Are calls two-way?
Yes. The phone genuinely registers as the extension, so it can place and receive calls exactly like a desk phone would.
How do I get access?
esim2sip onboards wholesale accounts by invitation. Send us a note at hello@esim2sip.io and we'll set up your account.
Ready to turn extensions into mobile lines?
Open the console if you already have an account, or request an invitation to get started.