Strange overnight international calls on the bill
Toll fraud: attacker hijacked a SIP account and dialled premium numbers.
Try this first
- 1Disable SIP account immediately, reset password
- 2Configure destination whitelist, no Cuba/Latvia by default
- 3Geo-restriction: registrations only from NL IP blocks
- 4Review PBX portal and SBC logs for odd REGISTER IPs
When to bring us in
Damage > 1000 euro? Talk to provider, fraud clause often shares risk.
See also
- Voys, BelXS or RoutIT, which cloud PBX fits?Three popular NL platforms, differences are admin UI, partner model and per-user price.
- Teams Phone: Calling Plan, Direct Routing or Operator Connect?Three ways to connect PSTN to Teams, cost and management differ a lot.
- 3CX: self-host on VPS or take 3CX cloud?Self-host saves licence, but you own SBC, backup and updates.
None of the above fits?
Describe your situation below. We pass your input plus the steps you already saw to our AI and return tailored next-step advice. If it's too risky to DIY, we'll say so.
Or skip the DIY entirely
Our Managed IT clients do not look these things up. One point of contact, a fixed monthly price, resolved within working hours.