› connectivity & telecoms
leased lines & wan
Leased LinesDedicated, uncontended fibreDedicated Internet AccessGuaranteed, SLA-backedFTTP & Full FibreUltrafast full fibreSD-WANIntelligent multi-site WANMulti-Site ConnectivityOne secure networkBackup ConnectivityAutomatic 4G/5G failovermobile
Business MobilesO2, Vodafone & EE airtimeSIM Only DealsFlexible 30-day & 24-monthMobile Broadband4G / 5G data-only SIMsStatic IP SIMsFixed IP for IoT & failovertelecoms
Cloud Hosted PBXVoIP phone system, powered by VoipingerSIP TrunkingConnect your PBX, cut call costsMicrosoft Teams PhoneCalling inside TeamsBusiness Phone NumbersLocal numbers in 145+ countriesCRM Integration250+ apps, click-to-dialAI Receptionist24/7 AI voice agentAI Contact CenterAI voice & chat at scale› cyber security
Wifinger
Our own guest Wi-Fi platform: a branded login page on the access points you already have, plus consent, analytics and marketing — designed, installed and managed by us.
Explore guest Wi-Fi› design · deploy · support
› surveillance & data infrastructure
Network consultancy that keeps you fast, secure and online
A reliable, fast network is essential to any business. Our Cisco, Aruba and Fortinet certified engineers design, install and maintain enterprise networks configured to industry best practice.
certified across leading vendors
Wireless› what we do
Configuring your network to industry best practice takes proficient engineers. Ours are certified and hands-on — here's how they help.
Network Consultation
Our engineers advise you on how to improve your network's performance, security and reliability.
Troubleshooting
If your network hits any issue, our team quickly diagnoses and repairs it to minimise downtime.
Network Design
We design a custom network that meets your business's specific needs and requirements.
Upgrades
We upgrade ageing infrastructure to modern, secure and supported hardware and firmware.
Maintenance
Regular maintenance keeps your network running smoothly and efficiently at peak performance.
Extension
We extend your network to support new devices, applications, sites or users as you grow.
› vendor expertise
Dedicated, in-depth consultancy for each vendor we're certified in — explore the full service, supported devices and FAQs for your platform.
Our Cisco & multi-vendor capabilities
CLI Secure offers professional network consulting to help businesses maintain secure, efficient networks tailored to their needs.
Network design & planning
Security assessment & implementation
Routing & switching optimisation
Wireless network design & optimisation
Network monitoring & management
Cloud & virtualisation integration
Infrastructure upgrades & migration
Firewall configuration & management
VPN implementation
Performance analysis & troubleshooting
Disaster recovery & business continuity
Support, maintenance & staff training
Certified network engineers
- Current Cisco certifications: CCNA, CCNP, CCIE and more
- Regular training & testing to stay current with the latest tech
- Extensive hands-on experience across Cisco, Aruba & Fortinet
- Security-first: we follow vendor security guidelines to protect you
› streamlined set-up
A simple, no-obligation process
Free pre-sales technical call
A 30–60 min scoping call with a senior (CCIE-track) engineer to agree exactly what's in scope.
Scope of Work & proposal
We submit a detailed SOW and commercial proposal — with no obligation to proceed.
Service agreement
On approval we issue the Service Agreement Form and agree a delivery timescale.
Delivery & support
We design, deploy and then maintain your network with prompt, certified support.
› faq
Most popular questions
› let's talk
Ready to hand off the IT headaches?
Leave your details and a London-based engineer will call you back — usually within one business hour. No sales scripts, no obligation.
Or explore Managed IT →