Lines & Calls
Smarter Business Calls. Lower Costs. Better Reliability.
Intech provides SIP trunks, hosted lines, geographic numbers and call plans that replace expensive legacy ISDN and PSTN lines with flexible, cost-effective alternatives — ready for the 2027 PSTN switch-off.
PSTN Switch-Off
The PSTN switch-off is coming
BT Openreach is switching off the legacy PSTN and ISDN network in 2027. Every business currently relying on traditional analogue or ISDN phone lines must migrate to IP-based alternatives before that deadline — or face losing their phone service entirely.
Intech helps businesses navigate this migration smoothly. We review your existing lines and call usage, recommend the right SIP trunk or hosted solution, and manage the full transition — including number porting — with zero disruption to your operations.
Don't leave it too late
ISDN and PSTN lines are already being withdrawn in many areas. Check your switch-off date and plan your migration now to avoid last-minute disruption.
SIP vs ISDN — the numbers
Why businesses switching to SIP are saving money immediately:
Lines & Call Services
A voice solution to suit every business
From single-site SMBs to multi-location enterprises, we have a voice solution to suit every business.
SIP Trunks
Replace your ISDN lines with SIP trunks that connect directly to your existing phone system. Scalable, reliable and significantly cheaper — with CLI presentation, DDI ranges and inbound call routing all included.
Geographic & Non-Geo Numbers
Local geographic numbers (01/02), national 03 numbers and 0800 freephone numbers — all available to order and port. Present multiple local presences from a single site or route calls intelligently across locations.
Business Call Plans
Simple, inclusive call bundles covering UK landlines, mobiles and international destinations. Fixed monthly costs make budgeting easy — no unexpected call bills at the end of the month.
Number Porting
Keep your existing numbers
Changing provider doesn't mean changing your number. We manage the full number porting process — from single DDIs to entire ranges — ensuring your calls continue without interruption throughout the transition.
Whether you're moving from BT, Virgin or another carrier, our porting team handles all the paperwork and coordinates the switchover date to minimise disruption.
Ready to cut your call costs?
We’ll review your current line and call spend and show you exactly how much you could save by switching to SIP. Call 023 8024 2525 — free analysis, no obligation.
Mon–Fri 8:30am–5:30pm · Emergency support 24/7
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