Replace your BT ISDN lines with hosted SIP trunks. Keep your existing Bristol phone numbers, cut call costs by up to 60% and get your business ready for what's coming ahead of the January 2027 PSTN switch-off.
Check availability at your postcode.
📍 CHECK AVAILABILITY
Enter your postcode to confirm availability at your premises.
Replace your BT ISDN lines with hosted SIP trunks. Keep your existing Bristol phone numbers, cut call costs by up to 60% and get your business ready for what's coming ahead of the January 2027 PSTN switch-off.
Port your existing local numbers to our SIP platform free of charge. Customers reach you on exactly the same numbers.
Add as many simultaneous call channels as needed. Scale up instantly without BT engineer visits.
SIP trunks are dramatically cheaper than ISDN — unlimited UK calls, lower international rates, no per-line BT rental.
Compatible with Cisco, Avaya, Panasonic, Mitel and all major PBX systems. Keep your existing hardware.
Calls reroute automatically if your broadband fails — to mobile, another site or voicemail.
BT's January 2027 switch-off makes ISDN obsolete. SIP trunks are the ready for the future replacement.
UK-based support team. No mid-contract price rises. One provider for broadband, phones, CCTV and more.
We compare your current ISDN costs and guarantee SIP will save you money. Show us your bill.
SIP trunks active within 24–48 hours. Number porting 5–10 working days.
Our engineers have configured SIP trunks on every major PBX brand.
Hosted on resilient UK data centres with 99.99% uptime and automatic failover.
Rolling monthly contracts available — we're confident enough in our service not to trap you.
Real technical support from UK-based engineers who understand your system.
Why Bristol businesses switch to Telexico and save up to 40%.
BT is permanently switching off all analogue PSTN and ISDN lines by January 2027. Every Bristol business on a traditional landline must migrate before the deadline. Telexico handles the full transition — free of charge.
Check If I'm Affected →"Moved our Bristol office from ISDN to Telexico SIP trunks. Saving £180/month and call quality is better than ever. Smooth transition."
"With the 2027 deadline approaching we needed to act. Telexico ported our numbers in 8 days, zero downtime. Couldn't ask for more."
"Had 6 ISDN lines at £45 each. Now on SIP trunks for a fraction of the cost. Should have switched years ago."
A SIP trunk replaces your BT ISDN or analogue lines with internet-based calling. If your Bristol business uses ISDN, you must migrate to SIP or VoIP before BT's January 2027 switch-off deadline.
Yes — we port your existing 0117 or other numbers to our SIP platform at no charge. Customers continue to reach you on the same numbers. Porting typically takes 5–10 working days.
SIP trunks are compatible with virtually all major PBX systems. Our engineers verify compatibility with your specific Bristol system before installation.
Most Bristol businesses save 40–60% on their monthly phone bill switching from ISDN to SIP. We provide a free bill comparison — contact us with your current BT invoice.
New SIP trunks are active within 24–48 hours. Number porting from BT takes 5–10 working days. We manage the entire process.
We'll beat your current provider's renewal price — or tell you honestly if we can't. Free quote, no obligation, no hard sell.
📞 0121 268 0121 · hello@telexico.com · UK-Wide Coverage