New 39Security Cybersecurity Training Days for 2026 and 2027
Practical one-day cybersecurity training is coming to Kent, Essex and Hertfordshire for business owners, managers and internal IT contacts.
Read more →Knowledge centre
Knowledge centre
Practical guidance for business owners and people responsible for IT, cybersecurity, networks and VoIP.
How to Book a 50% Discounted Cybersecurity Review
Book a focused 60-minute cybersecurity review for £100—half the normal £200 consultation fee—and leave with clearer priorities.
Read more →Why Every Company Should Set Up DMARC for Its Email Domain
DMARC helps stop criminals impersonating your domain and gives you visibility into which services are sending email in your name.
Read more →Cybersecurity Is Business Resilience, Not Just an IT Problem
Cyber incidents affect revenue, customer service, cash flow and reputation, so security decisions belong in business planning.
Read more →Why Small Businesses Need Layered Cybersecurity
There is no single security product that stops every attack. SMEs need several practical controls that support one another.
Read more →Small-Business Cybersecurity Training in Kent — 7 October 2026
Join 39Security at Medway Yacht Club in Rochester for a practical day of cybersecurity training for SME decision-makers.
Read more →Small-Business Cybersecurity Training in Essex — 4 November 2026
A practical 39Security training day at the Delta Hotel in Waltham Abbey for owners, managers and people responsible for IT.
Read more →Small-Business Cybersecurity Training in Hertfordshire — 3 February 2027
Start 2027 with a practical 39Security training day at Rothamsted Conference Centre in Harpenden.
Read more →How to Secure a SIP Server Behind a MikroTik Router
Reduce SIP exposure with strict firewall rules, trusted source ranges, VPN or SBC access, secure administration and protected media.
Read more →Why You Should Use SIP TLS—and Why TLS Alone Is Not Enough
SIP TLS protects call signalling in transit, while SRTP protects the audio. Use both where the complete call path supports them.
Read more →How to Set Up Traffic Shaping for Better SIP Calls
A practical VoIP QoS guide for FortiGate, MikroTik, EdgeRouter, pfSense and BT Hub connections, including what shaping can and cannot fix.
Read more →How to Troubleshoot Poor SIP Call Quality
A structured way to diagnose one-way audio, robotic speech, drop-outs, delay, failed calls and intermittent VoIP problems.
Read more →How poor BGP design costs businesses thousands every year
Why established sessions can still hide weak routing policy, avoidable transit cost and failure behaviour nobody has tested.
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