Old ISDN conference bridge or POTS conferencing keeps dropping

ISDN is end-of-life in the Netherlands, KPN has largely phased it out. An ISDN bridge or analogue speakerphone on a POTS line must be replaced with a SIP or meeting-app route.

Try this first

1. 1List which rooms still sit on ISDN or analogue line, usually one or two old board rooms.
2. 2Check the line status with the provider, migration to all-IP is almost certainly already planned.
3. 3For classic audio conferencing, you can offer a dial-in via Microsoft Teams Phone, Zoom Phone or a SIP trunk.
4. 4For video bridge to old H.323 systems, sometimes at government partners, a gateway like Pexip or Cisco WebEx Edge is needed.
5. 5Plan a dual-coverage test period before cancelling the old line, or you miss an important call.
6. 6Document the dial-in per room and communicate it to contacts in time.

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