Private Branch Exchange (PBX) best practice
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Protecting your organisation’s telephony systems from cyber attacks and telecoms fraud.
Adapted edition
- Document type
- Reference Guide
- Format
- DOCX
- Pages
- 5
- Language
- English
- Version
- 1.0
- Updated
- 2026-09-16
- Category
- Information security
- Licence
- Open Government Licence v3.0
Description
Protecting your organisation’s telephony systems from cyber attacks and telecoms fraud for organisational planning, review and training. NCSC guidance is advisory and should be applied to the organisation's own risks and obligations.
Contents
- Note:
- Introduction
- What is a PBX?
- Types of PBX
- Traditional PBX
- IP PBX
- Hosted/cloud PBX
- Virtual PBX
- Hybrid PBX
- General mitigations for PBX systems
- Secure access controls and user authentication
- Limit calls
- Contracts
- Monitoring and logging
- Password management
- Firewall and intrusion detection/prevention
- Source links
Source and licence
National Cyber Security Centre
AttributionNational Cyber Security Centre, “Private Branch Exchange (PBX) best practice” (20 February 2024), reused under the Open Government Licence v3.0.
ChangesAdapted 16 September 2026: converted the official HTML article into neutral text-only DOCX and PDF editions. Preserved article headings, paragraphs, lists and plain-text source-link destinations; normalized web whitespace and typographic punctuation; omitted site navigation, topic and download cards, images, logos, scripts, styles and page furniture.
Version history
- v1.016/09/2026