Our ISDN line still works, does it have to go?
KPN has phased out most ISDN/PSTN, remainder via SIP converter or all-IP.
Try this first
- 1Check the letter from KPN or provider about the shutdown date
- 2Short term: ISDN-to-SIP converter (Patton, AudioCodes) in front of old PBX
- 3Long term: cloud PBX or new IP PBX
- 4Plan porting early, do not wait until the cutoff day
When to bring us in
Old PBX is end-of-life? Vectel migrates to cloud while keeping numbers.
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.