UK’s ISDN and PSTN network switch off in January 2027
What’s happening?
We are in the process of transitioning our customers from the outdated analogue public switched telephone network (PSTN) to a completely digital network. This migration has already begun, and our goal is to complete the transition for all customers prior to Openreach discontinuing the PSTN and ISDN service in 2027. By that time, every telephone line in the UK will be digitally connected.
Important Update: Price Changes from April 2026
In addition to planning for the Big Switch Off, we would like to inform you that, from April, prices for a number of key services will be adjusted to reflect increased operating costs arising from supplier price increases.
Full details of applicable price increases will be provided on your current invoice.
Legacy products to be discontinued include:
| Legacy Product | Description | Replacement Technology |
|---|---|---|
| PSTN (Public Switched Telephone Network) | The traditional, analogue telephone landline service that provides a standard dial tone for making and receiving calls. Also known as “Classic Products.” | VoIP (Voice over IP) or Digital Voice (e.g., via Fibre or SoGEA) |
| WLR (Wholesale Line Rental) | The term Openreach uses for the core copper line rental product that underpins PSTN services and older broadband products. | SoGEA (Single Order Generic Ethernet Access) or FTTP (Full Fibre) |
| ISDN2 / ISDN30 (Integrated Services Digital Network) | Digital phone lines, mainly used by businesses for higher capacity or more advanced features. ISDN2 is for 2-8 channels; ISDN30 is for up to 30. | SIP Trunking or Hosted Voice/Cloud PBX |
| ADSL (Asymmetric Digital Subscriber Line) | The earliest widely available copper-based broadband service, which runs over the old analogue phone line (PSTN/WLR). | SoADSL (Single Order ADSL), SoGEA, or FTTP |
| FTTC (Fibre to the Cabinet) – Voice component | Broadband that uses fibre optic cable to the street cabinet, and then copper to the premises. The voice part of this service relies on the PSTN/WLR line. | SoGEA (FTTC without the analogue voice line) or FTTP |
Important Update: Price Changes from January 2026
In addition to planning for the Big Switch Off, we would like to inform you that, from January, prices for a number of key services will be adjusted to reflect increased operating costs arising from supplier price increases. These changes include pricing adjustments for the following:
- Call rates and call bundles
- Gamma Inbound services
- Gamma Horizon
- iPECS Cloud
- IPVoice
- SIP Trunks
- TelcoSwitch services
- 3CX platform licences
- Hosted number porting
- Office 365 subscriptions
- Fax2Email services
These price changes will take effect from January and will be reflected on your invoices accordingly. We aim to keep any increases as closely aligned with supplier price increases as possible while maintaining the high quality of service your business expects.