Short answer: Door entry and intercom panels that dial a phone line to reach staff will lose that path when the line is withdrawn by January 2027. SIP-compatible panels connect straight to a VoIP system, and a 4G adapter can keep a legacy panel working until it is replaced. Part of the wider PSTN and ISDN switch off.
Why door entry is affected
Many intercom and door release systems call a phone line to alert staff that someone is at the door. When that line is withdrawn, the call has nowhere to go, so visitors cannot be answered or let in from a handset.
What to do
- Move to a SIP door entry panel from a manufacturer such as 2N, Akuvox or Grandstream. It connects to your SIP trunk or hosted VoIP so door calls ring your handsets and mobile app.
- Bridge a legacy panel with a 4G adapter where it cannot be replaced immediately.
- Answer the door from anywhere by routing door calls to the VoIP mobile app, useful for small teams and multi-site sites.
Frequently asked questions
Will my door entry system work after the PSTN switch off?
Door entry and intercom panels that dial a phone line to reach staff will lose that path when the line is withdrawn by January 2027. SIP-compatible panels connect to a VoIP system, and a 4G adapter can bridge a legacy panel that cannot be replaced immediately.
What replaces a phone-line intercom?
SIP door entry panels from manufacturers such as 2N, Akuvox or Grandstream connect directly to a SIP trunk or hosted VoIP system, so calls from the door ring your handsets or mobile app. Where the panel cannot be replaced yet, a 4G adapter keeps it working.
Can door calls ring a mobile?
Yes. With a SIP door panel and a hosted VoIP system, a door call can ring desk phones and the mobile app, so visitors are answered whether staff are at a desk or moving around the building.
Door entry on an old phone line?
We can check how your intercom connects and move it to SIP or 4G so the door still reaches your team. See the full ISDN and PSTN switch off guide.