Leased Line & SIP Trunks – Reliable Business Connectivity
High-speed leased lines and secure SIP trunking to keep your business connected, efficient, and future-ready.
A fast, reliable internet connection and a modern phone system are the backbone of every business. At SCIS UK, we provide leased line internet and SIP trunks to ensure your team stays connected, your calls remain clear, and your business never misses an opportunity.
What is a Leased Line?
Dedicated Leased Line Internet in Lincolnshire.
Unlike standard broadband, a leased line is a dedicated, uncontended internet connection reserved exclusively for your business. That means:
Guaranteed Speeds
Symmetrical upload & download, up to 10Gbps.
Reliable Performance
No slowdowns, even at peak times.
Secure Connection
Dedicated circuit, not shared with neighbours.
Business Continuity
Ideal for VoIP, video conferencing, cloud apps, and remote work.
What are SIP Trucks?
SIP Trunks – Smarter Business Telephony.
A SIP trunk replaces traditional ISDN lines, connecting your business phone system to the internet. With ISDN being phased out, SIP is the future-proof solution.
Lower Call Costs
Cheaper than ISDN, especially for international calls.
Scalable
Add lines instantly without new hardware.
Flexible Routing
Reroute calls in case of outage or office relocation.
VoIP-Ready
Integrates seamlessly with 3CX and hosted telephony solutions.
Leased Line vs Standard Broadband
| Standard Broadband | Business Leased Line | |
|---|---|---|
| Speeds | Up to 900Mbps download, but slower upload | Symmetrical up to 10Gbps |
| Reliability | Shared network, prone to congestion | Dedicated, uncontended line |
| SLA | Best effort | Business-grade SLAs, 99.9% uptime |
| VoIP Performance | May suffer jitter/latency | Optimised for VoIP & video |
Leader more about our Broadband & Mobile Solutions
FAQs
What speed leased lines can I get?
We offer speeds from 100Mbps to 10Gbps, tailored to your needs.
Can I keep my existing phone numbers with SIP?
Yes, we can port your numbers from ISDN or other providers.
What happens if my leased line goes down?
We provide failover options, including backup broadband, to keep you online.
How much do leased lines cost?
Prices vary depending on speed and location — request a tailored quote today.
Is SIP secure?
Absolutely. SIP trunks are encrypted and protected against fraud when configured correctly.
Who we help
- Small & medium businesses needing predictable costs and scalability
- Schools & Colleges requiring reliable internet and phone lines
- Multi-Site Companies linking offices with one system
- Remote & hybrid relying on video calls and cloud apps
Ready for Faster, Smarter Connectivity?
Whether you need a dedicated leased line for reliable internet, or SIP trunks to future-proof your phone system, SCIS UK has the expertise to deliver.