PSTN or ISDN line still works, KPN is sunsetting, what now?

KPN has reached end-of-life on analogue PSTN and ISDN for business. If you still have a real copper line, you get a cancellation or migration letter and must move to all-IP (VoIP).

Try this first

1. 1Inventory all still-active copper lines (alarm, lift, fax, ATM, main phone).
2. 2Plan a migration path per line: VoIP, GSM router, IP version of alarm dialler, lift emergency line with dual SIM.
3. 3Do not migrate critical lines last-minute, there is certification involved.
4. 4Port existing numbers to a VoIP provider before the cutover date.

None of the above fits?

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