Written question asked by Vikki Slade (Liberal Democrat) on Monday, 1 June 2026, in the House of Commons. It was due for an answer on Thursday, 4 June 2026 (named day). It was answered by Kanishka Narayan (Labour) on Thursday, 4 June 2026 on behalf of the Department for Science, Innovation and Technology.
Voice over Internet Protocol
- Question
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To ask the Secretary of State for Science, Innovation and Technology, what data her Department holds the percentage of landline telephone connections that have been migrated from the Public Switched Telephone Network to digital voice services.
- Answer
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The analogue Public Switched Telephone Network (PSTN) is a privately-owned telecoms network and the decision to upgrade it to digital Voice over Internet Protocol (VoIP) was taken by the telecoms industry in 2017.
Over 92% of PSTN landlines have already been migrated to VoIP. As of 31 March 2026, fewer than 2.8 million PSTN lines remain operational, down from 35.2 million PSTN lines at the network’s peak.
Secondary information
- Type
- Written question
- Reference
- 5481
- Session
- 2026-27
- Subjects
- Voice over internet protocol
- Contains statistics
- Yes
- Link
- View this Written question on www.parliament.uk
Librarians' tools
- Timestamp
- 2026-06-04 15:48:38 +0100
- URI
- http://data.parliament.uk/writtenparliamentaryquestion/commons/2026-27/5481
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- http://indexing.parliament.uk/Content/Edit/1?uri=http://data.parliament.uk/writtenparliamentaryquestion/commons/2026-27/5481
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