Guides for UK businesses moving their phones.
Setup walkthroughs, technology explainers and the unsexy operational stuff most providers hide behind a sales call. 77 articles and counting — written by an Ofcom-licensed UK carrier.
Latest
- Call intelligence17 July 2026 · 8 min read
Every call, written up and waiting in your inbox — meet transcribed
transcribed turns calls on your enabled NumberGroup numbers into readable transcripts with AI summaries, caller mood, escalation flags, Time to answer, optional customer-specific QA scorecards and a one-tap read-along player — emailed shortly after the call ends. No app for your team to install, and call analysis is designed to run on NumberGroup infrastructure in the UK.
- Compliance17 July 2026 · 8 min read
The 24/7 helpline rule for EV charge points — and the quarterly report nobody warns you about
Under the Public Charge Point Regulations 2023, every UK charge point operator must run a free, staffed 24/7 helpline and file a quarterly report to the government — total calls, the type of help sought, and how long calls took to resolve in 10-minute bands, with no personal data. What Regulation 9 actually requires, where operators get caught out, and how NumberGroup turns the calls you already handle into the return itself.
- SIP trunking29 June 2026 · 6 min read
Connect a Yeastar P-Series PBX to a NumberGroup SIP trunk
Add a NumberGroup SIP trunk to a Yeastar P-Series PBX (P550, P560, P570) using a General Register Trunk. Real config: sip.numbergroup.com host, T-AAAAAA-NNN username and authentication name, DDIs, routes and the common registration pitfalls.
Onboarding · 3
- Onboarding6 June 2026 · 7 min read
Your first week with NumberGroup: a quick onboarding checklist
You've just joined Membership. Here's the 30-minute checklist to get your numbers, trunks, hardware, fraud caps and 999 emergency address set right — so the rest of your time on the platform is boring (in a good way).
- Onboarding6 June 2026 · 8 min read
Porting your existing UK number to NumberGroup: timelines, forms and what can go wrong
Step-by-step walkthrough of the UK number-porting process — the LOA (Letter of Authority), realistic timelines (5–10 days for geographic, 10–15 for ISDN30 estates), pitfalls to avoid, and how Ofcom GC C7 protects you.
- Onboarding6 June 2026 · 5 min read
Setting your 999 emergency address — Ofcom CESID compliance for VoIP
VoIP and SIP trunks don't have a physical line address, so 999 / 112 operators rely on the address you registered. Why it matters, what Ofcom requires under GC A3, and how to update yours in the NumberGroup portal.
CRM & integrations · 6
- CRM & integrations6 June 2026 · 12 min read
Real-time call events and recording webhooks: build your own CRM, analytics or call-tracking integration
NumberGroup pushes every call state change (offered → connected → disconnected) and the resulting WAV recording to a webhook URL you control. Full protocol reference, lifecycle, a working Node.js / Next.js receiver, and integration patterns for HubSpot, Google Ads offline conversions and Slack.
- CRM & integrations6 June 2026 · 9 min read
NumberGroup call webhooks explained: start-of-call, end-of-call, and the variable mechanism
How the webhook mechanism actually works — start-of-call hooks for routing decisions, end-of-call hooks for CRM logging, conditional firing, regex-based variable extraction, and how to wire it up to your own backend (or a Cloudflare Worker).
- CRM & integrations6 June 2026 · 9 min read
Connect HubSpot CRM to NumberGroup: log calls, create contacts, attribute calls to deals
Working setup for piping NumberGroup call data into HubSpot — small webhook receiver, HubSpot Contacts API, Calls activity timeline, deal-attribution patterns. Honest, no managed-integration upsell.
- CRM & integrations6 June 2026 · 9 min read
Connect Salesforce to NumberGroup: log calls, populate Activity History, attribute to Opportunities
Push NumberGroup call events into Salesforce — Task records on Contact / Lead / Opportunity, the Activity History feed, Lightning Voice considerations, and OAuth-flow receiver implementation.
- CRM & integrations6 June 2026 · 7 min read
Connect Pipedrive to NumberGroup: log inbound and outbound calls against deals
Wire NumberGroup call data into Pipedrive — Activity records, person matching by phone number, deal attribution, and the Pipedrive API quirks worth knowing.
- CRM & integrations6 June 2026 · 7 min read
Connect Zoho CRM to NumberGroup: log calls, match leads by phone number, fire workflow rules
Push NumberGroup call events into Zoho CRM — Calls module records, lead/contact matching, workflow-rule triggers, and the Zoho One vs Zoho CRM gotcha to know.
Freephone numbers · 4
- Freephone numbers6 June 2026 · 8 min read
5 reasons to buy an 0800 number for your UK business
Why 0800 freephone numbers still convert better than mobile or local landlines for UK businesses — and the honest counterpoints. Includes Membership pricing so you can see the true cost end-to-end.
- Freephone numbers6 June 2026 · 8 min read
10 reasons why an 0800 number matters for UK startups
From conversion uplift to call analytics — why an 0800 number gives a new business outsized credibility, and how to get one without burning startup runway on per-minute redirect fees.
- Freephone numbers6 June 2026 · 8 min read
What it really costs to call 0800 numbers from a mobile in 2026
Free for the caller since 1 July 2015 — but only on UK mobile networks. The full picture: what the business pays, what landlines vs mobiles cost, Ofcom UK Calling access charge + service charge, payphones, business lines, abroad.
- Freephone numbers6 June 2026 · 11 min read
0800 Numbers Explained — Everything You Need To Know
A complete guide to UK 0800 freephone numbers. What they cost in 2026, how to get one without renting from a middleman, what callers actually pay, and how the calls work end-to-end. Written by an Ofcom-licensed UK carrier.
Memorable numbers · 6
- Memorable numbers6 June 2026 · 7 min read
Best 0800 numbers for taxi and private-hire firms — the recall science applied
Taxi customers ring in a hurry, often from a noisy street, often three drinks in. The number on the side of the cab has to be repeated, dialled and remembered in under 10 seconds. Number patterns that meet that bar.
- Memorable numbers6 June 2026 · 7 min read
Best 0800 and 020 numbers for UK law firms — credibility on the letterhead
Why most UK law firms run 020 or 03 rather than 0800, when 0800 actually wins, and how to pick a number that pays back over the 20-year life of a partnership without looking like a claims line.
- Memorable numbers6 June 2026 · 7 min read
Best 0800 numbers for plumbers, electricians and emergency trades
Emergency trade numbers earn their cost in a single panicked Sunday-night phone call. What makes a tradesperson's 0800 stick when a customer is standing in 2 inches of water — and why the right number lives on the van for 25 years.
- Memorable numbers6 June 2026 · 9 min read
Why memorable phone numbers actually work: the cognitive science of digit recall
Why "0800 100 1000" sticks in your head and "0800 947 6132" doesn't. The chunking maths (Miller's 7±2), repetition heuristics, mirror patterns, keypad-spelled words — and what the research says about how much recall lift a memorable number really gives a business.
- Memorable numbers6 June 2026 · 7 min read
How we tier memorable phone numbers — the transparent methodology
Standard, bronze, silver, gold, platinum, cherished. What each tier means, what we look at when scoring a number, and why two superficially similar 0800s can be £200 apart. No quote-on-request mystery.
- Memorable numbers6 June 2026 · 9 min read
Memorable phone numbers for business: what makes one, what they cost, why they pay back
What actually makes a phone number memorable, how UK Ofcom price bands work, and how to pick one without overpaying. Real worked examples from NumberGroup's inventory of 0800, 03 and London memorable numbers.
SIP trunking · 30
- SIP trunking29 June 2026 · 6 min read
Connect a Yeastar P-Series PBX to a NumberGroup SIP trunk
Add a NumberGroup SIP trunk to a Yeastar P-Series PBX (P550, P560, P570) using a General Register Trunk. Real config: sip.numbergroup.com host, T-AAAAAA-NNN username and authentication name, DDIs, routes and the common registration pitfalls.
- SIP trunking29 June 2026 · 6 min read
Connect a Grandstream UCM to a NumberGroup SIP trunk
Add a NumberGroup SIP trunk to a Grandstream UCM6200/6300 IP PBX with a Register SIP Trunk. Real config: sip.numbergroup.com host name, T-AAAAAA-NNN username and authenticate ID, caller ID, inbound and outbound routes, and the registration status check.
- SIP trunking29 June 2026 · 6 min read
Connect a Yeastar S-Series PBX to a NumberGroup SIP trunk
Add a NumberGroup SIP trunk to a Yeastar S-Series PBX (S20, S50, S100, S300) using a General Register Trunk. Real config: Settings > PBX > Trunks, sip.numbergroup.com Hostname/IP and Domain, T-AAAAAA-NNN Username, Authentication Name and From User, DIDs, routes and the registration pitfalls.
- SIP trunking29 June 2026 · 5 min read
Connect a Grandstream HandyTone ATA to a NumberGroup SIP trunk
Put an existing analogue phone, fax machine or cordless base on a NumberGroup SIP trunk with a Grandstream HandyTone ATA (HT801, HT802, HT812). Real FXS-port config: sip.numbergroup.com Primary SIP Server, T-AAAAAA-NNN SIP User ID and Authenticate ID, codecs, T.38 fax and the registration pitfalls.
- SIP trunking29 June 2026 · 5 min read
Connect a Cisco ATA to a NumberGroup SIP trunk
Put an existing analogue phone, fax machine or cordless base on a NumberGroup SIP trunk with a Cisco ATA 191 or ATA 192 (multiplatform firmware). Real Voice > Line config: sip.numbergroup.com Proxy, T-AAAAAA-NNN User ID and Auth ID, Use Auth ID, codecs, T.38 fax and the registration pitfalls.
- SIP trunking29 June 2026 · 7 min read
Connect a Panasonic KX-NS PBX to a NumberGroup SIP trunk
Add a NumberGroup SIP trunk to a Panasonic KX-NS700, KX-NS1000 or KX-NSX PBX via the V-SIPGW16 virtual card in the Maintenance Console. Real config: sip.numbergroup.com SIP Server, T-AAAAAA-NNN User name and Authentication ID, the activation-key prerequisite, DDI routing, CLI and registration pitfalls.
- SIP trunking22 June 2026 · 4 min read
Luna PBX: the NumberGroup softphone for mobile and desktop
Make and receive calls on your NumberGroup number from your phone or laptop with the Luna PBX app — iPhone, Android, Windows and Mac. Log in by QR code, no SIP setup. HD voice, transfer, hold and call recording built in.
- SIP trunking22 June 2026 · 3 min read
Plug-and-play desk phones: Grandstream IP phones, pre-configured by us
Order a Grandstream desk phone from NumberGroup and it arrives ready to use — pre-provisioned to your account. Plug in the power and an Ethernet cable to your broadband, and it works. No setup, no web UI, no IT person.
- SIP trunking21 June 2026 · 5 min read
Connect a Gigaset N-series DECT phone to a NumberGroup SIP trunk
Map your NumberGroup SIP trunk credentials onto a Gigaset N530/N670/N870 IP PRO DECT base — create a provider profile, add a SIP account, then assign it to a handset. Mapping table plus Gigaset's own Admin Master guide.
- SIP trunking6 June 2026 · 8 min read
Connect a Mitel MiVoice (3300 MXE / MiVoice Business) to a NumberGroup SIP trunk
Add a NumberGroup SIP trunk to Mitel MiVoice Business — SIP peer profile, ARS routing, registration credentials, CESID, codec settings, and the Mitel-specific gotchas (5060 vs 5070, MiAUDA, codec re-negotiation).
- SIP trunking6 June 2026 · 8 min read
Connect Avaya IP Office to a NumberGroup SIP trunk
Add a NumberGroup SIP trunk to Avaya IP Office (R11/R12) via IP Office Manager — SIP Line configuration, transport, URI / Caller ID, ARS short codes, incoming call route. Real working values.
- SIP trunking6 June 2026 · 6 min read
Connect a Poly (Polycom) VVX desk phone directly to a NumberGroup SIP trunk
Register a Poly VVX 150 / 250 / 350 / 450 (formerly Polycom) directly to a NumberGroup SIP trunk — web UI walkthrough, line config, codec list, dial-plan, NAT, and the UC software version that matters.
- SIP trunking6 June 2026 · 6 min read
Set up Groundwire / Acrobits Softphone with a NumberGroup SIP trunk
How to register the branded NumberGroup softphone (Acrobits Groundwire) — or the off-the-shelf Acrobits Softphone — to a SIP trunk. Push notifications, CallKit, codecs and the call-recording bolt-on.
- SIP trunking6 June 2026 · 6 min read
Use a UK business number on iPhone that rings like a native call (CallKit explained)
iOS doesn't have a native SIP profile in the Phone app — but CallKit makes any SIP softphone (Groundwire, Linphone, Zoiper Premium) ring on the lock screen exactly like a real phone call. The honest mechanism and which apps support it.
- SIP trunking6 June 2026 · 9 min read
Connect Cisco Unified Communications Manager to a NumberGroup SIP trunk
Add a NumberGroup SIP trunk to Cisco CUCM 12.5/14/15 — SIP profile, trunk security profile, SIP trunk config, route pattern, inbound translation pattern. Real config with sip.numbergroup.com and T-AAAAAA-NNN auth.
- SIP trunking6 June 2026 · 6 min read
Connect a Yealink desk phone to a NumberGroup SIP trunk
Register a Yealink T-series IP phone (T31, T33, T46, T54) directly to a NumberGroup SIP trunk — web UI walkthrough, codec settings, NAT, dial-plan and the firmware version gotcha to know.
- SIP trunking6 June 2026 · 5 min read
Connect Linphone softphone to a NumberGroup SIP trunk
Free, open-source softphone for desktop and mobile. Add a NumberGroup SIP trunk to Linphone in 2 minutes — proxy, transport, codecs, audio quality settings that actually work.
- SIP trunking6 June 2026 · 5 min read
Connect MicroSIP to a NumberGroup SIP trunk (Windows)
Lightweight Windows SIP softphone. Register MicroSIP to a NumberGroup SIP trunk in 90 seconds — accounts dialog, NAT settings, codec preferences, hotkeys for power users.
- SIP trunking6 June 2026 · 8 min read
Connect 3CX to a NumberGroup SIP trunk: step-by-step setup
Add a NumberGroup SIP trunk to 3CX Phone System using the built-in generic provider template. Real config: sip.numbergroup.com registrar, T-AAAAAA-NNN auth ID, inbound and outbound rules, common pitfalls.
- SIP trunking6 June 2026 · 8 min read
Connect FreeSWITCH to a NumberGroup SIP trunk: gateway config that works
Working FreeSWITCH gateway XML for a NumberGroup SIP trunk — sip.numbergroup.com registrar, T-AAAAAA-NNN auth, inbound dialplan that routes by DDI in R-URI, NAT and codec settings.
- SIP trunking6 June 2026 · 7 min read
Connect a Grandstream desk phone directly to a NumberGroup SIP trunk
Skip the PBX — register a Grandstream GXP1625, GXP2135 or GXP2170 directly to a NumberGroup SIP trunk. Account profile settings, codecs, NAT, hotline, dial-plan, and the LCD status check that confirms registration.
- SIP trunking6 June 2026 · 6 min read
Connect Zoiper softphone to a NumberGroup SIP trunk (mobile + desktop)
Add a NumberGroup SIP trunk to Zoiper 5 on iOS, Android, Windows or macOS in 90 seconds. Manual SIP account config, push notifications, codec settings, and the wake-up gotcha to know.
- SIP trunking6 June 2026 · 5 min read
Connect a Snom desk phone to a NumberGroup SIP trunk
Map your NumberGroup SIP trunk credentials to the right fields on a Snom D-series desk phone (D717, D735, D785, D862). Field-by-field mapping table plus a link to Snom's own web-UI guide.
- SIP trunking6 June 2026 · 5 min read
Connect a Fanvil desk phone to a NumberGroup SIP trunk
Map your NumberGroup SIP trunk credentials to the right fields on a Fanvil X-series IP phone. Field-by-field mapping table plus a link to Fanvil's own model manual for the exact navigation.
- SIP trunking6 June 2026 · 5 min read
Connect an Htek desk phone to a NumberGroup SIP trunk
Map your NumberGroup SIP trunk credentials onto an Htek UC-series IP phone — where the server lives on the Profile page and the credentials on the Account page. Field-by-field mapping table plus Htek's own guide.
- SIP trunking6 June 2026 · 5 min read
Connect a Grandstream DP-series DECT phone to a NumberGroup SIP trunk
Map your NumberGroup SIP trunk credentials onto a Grandstream DP750/DP752 DECT base — Profile holds the server, SIP Account holds the credentials, and Handset Line assigns it to a handset. Mapping table plus Grandstream's own guide.
- SIP trunking6 June 2026 · 5 min read
Connect a Yealink W-series DECT phone to a NumberGroup SIP trunk
Map your NumberGroup SIP trunk credentials onto a Yealink W-series DECT base (W56/W60/W70 single-cell, W80/W90 multi-cell) and assign the account to a handset. Mapping table plus Yealink's own guide.
- SIP trunking6 June 2026 · 5 min read
Connect a Snom M-series DECT phone to a NumberGroup SIP trunk
Map your NumberGroup SIP trunk credentials onto a Snom M300/M700/M900 DECT base — create a Server, add an Extension that uses it, then register a handset. Mapping table plus Snom's own admin guide.
- SIP trunking6 June 2026 · 5 min read
Connect Bria (CounterPath) softphone to a NumberGroup SIP trunk
Map your NumberGroup SIP trunk credentials onto Bria Solo, Teams or Enterprise on desktop and mobile — domain, username, password, set in the Bria Portal. Mapping table plus CounterPath's own guide.
- SIP trunking6 June 2026 · 9 min read
How to connect Asterisk to a SIP trunk: working sip.conf and extensions.conf
Step-by-step guide to receiving SIP calls on an Asterisk PBX from NumberGroup. Working sip.conf, extensions.conf, debugging commands, NAT/firewall gotchas, and what to do when the trunk won't register.
Business phones · 3
- Business phones6 June 2026 · 9 min read
Carrier-direct vs reseller: who actually owns your UK phone number?
Most UK businesses don't realise their 'telecom provider' is a reseller buying from a wholesaler buying from a carrier. Why that matters when you port, when there's an outage, when prices rise, and when your provider quietly disappears.
- Business phones6 June 2026 · 11 min read
Choosing the right business phone system: an honest 2026 buyer's guide
Three options for a UK business phone system in 2026 — on-prem PBX, hosted cloud PBX, or pure softphone — what each costs, who each suits, and the questions to ask before you sign. No vendor fluff.
- Business phones6 June 2026 · 7 min read
Why your business shouldn't advertise a mobile number
Mobile numbers feel convenient but cost UK businesses credibility, calls and customers. The honest case for a proper business line — and how to keep your mobile in the loop with smart routing.
Switching · 7
- Switching26 June 2026 · 10 min read
How to get out of a 4Com contract — the 7-year lease explained
Trapped in a long 4Com deal? A plain-English guide to how the contract and separate equipment lease are structured, what leaving really costs, the verified complaint routes (Communications Ombudsman, the FCA / Financial Ombudsman for the lease), the free Subject Access Request that gets you your sales-call recording, and how to move your numbers to safety while you fight it. Help first — whether or not you ever switch to us.
- Switching22 June 2026 · 6 min read
That “account review” isn't service. It's a sales call.
The regular 'account review' call is a sales call wearing a service badge — and the industry says so itself. Pricing consultants openly advise telcos to use 'targeted cross- and upselling campaigns' on existing customers, who are 50% more likely to buy. How to spot the upsell behind the courtesy, and why nobody here has a target to feed.
- Switching22 June 2026 · 6 min read
Why is it always a five-year contract? (It was never for you)
Business telecoms deals are never one year — they're three, five, sometimes seven. Here's the real reason: sales commission is paid upfront against the full term, so a longer lock-in is a bigger payday on the day you sign. With Ofcom's own evidence on commission and clawback, and a BBC expert on contracts built 'solely to maximise finance revenue'.
- Switching22 June 2026 · 7 min read
The contract you didn't really get to read
Ofcom fined BT, EE and Plusnet £2.8m for failing to give 1.1 million customers clear contract terms before they signed. A BBC investigation filmed sales pitches that didn't match the paperwork. Why 'sign today' is the trap for small businesses with no cooling-off period — and what to check before you sign anything.
- Switching22 June 2026 · 6 min read
“Delighted to announce we've been acquired” — what it really means
When your telecoms provider sends the upbeat acquisition email, the team who knew your business often vanishes into a call centre and prices drift up to the new group's standard. Inside the UK consolidation wave — and why staying independent for sixteen years, and declining offers to sell, is the whole point.
- Switching22 June 2026 · 7 min read
Your provider won't release your number? Here's how to force it
Refusing to release your number is often a breach of Ofcom's General Condition C7 — you don't need your old provider's goodwill to leave. Your rights, the escalation steps, and the case NumberGroup took to Ofcom: a provider fined £20,000 for holding a customer's number hostage for over two years.
- Switching6 June 2026 · 9 min read
Switching phone supplier UK: what business owners actually need to know
Number porting, contract notice, due-diligence on the new carrier, the 5-step migration plan, and the legal protections every UK business has under Ofcom General Conditions C7. Honest walkthrough.
Cost reduction · 4
- Cost reduction22 June 2026 · 8 min read
Sick of being ripped off just to make a phone call?
Mid-contract price rises, five-year lock-ins, exit fees and a bill you can't decode — UK small businesses are treated as a product to be financed and sold, not a customer to be served. How the extraction machine works, with the regulator's and the BBC's own findings — and the fixed-price, zero-markup membership we built to end it.
- Cost reduction22 June 2026 · 6 min read
Why did my business phone bill go up mid-contract?
You signed at one price and a year later it's higher, with no say in it. How inflation-linked mid-contract rises worked, the Ofcom ban from January 2025 that requires prices in pounds and pence, and why the 'small annual adjustment' was never about their costs — it was inflating their sale price, funded by you.
- Cost reduction22 June 2026 · 6 min read
They only found you a discount when you tried to leave
The retention offer that appears the moment you cancel is proof the cheaper price was always there. Citizens Advice documented a 'loyalty penalty' — around £113 a year, 96% think it unfair, ~£4.2bn of consumer detriment. Why staying loyal costs you, and why there's one price for everyone here.
- Cost reduction6 June 2026 · 8 min read
Cutting business telecom costs: 5 honest tips for UK company directors
Most UK businesses overpay for phones by 30–60%. Where the waste hides — CPI-linked uplifts, per-line rental, per-feature bolt-ons, multi-supplier confusion — and how a flat-fee Membership model removes most of it.
Marketing · 4
- Marketing6 June 2026 · 8 min read
Track inbound phone calls in Google Ads: import calls as offline conversions
Tell Google Ads which campaigns generate phone calls — not just web form fills — and watch CPA drop 20–40%. The GCLID workflow, the CSV format, the threshold that counts as a qualifying conversion, and how to wire it up with NumberGroup call data.
- Marketing6 June 2026 · 8 min read
Dynamic Number Insertion (DNI) explained: per-visitor tracking numbers on your website
How DNI works under the hood, why it beats static tracking numbers, the JavaScript snippet, the SEO NAP-consistency gotcha, and how to wire it up against NumberGroup-allocated number pools.
- Marketing6 June 2026 · 7 min read
Attribute phone calls to Meta and LinkedIn ad campaigns
Google Ads has offline-conversion import for calls. Meta and LinkedIn don't — but you can still attribute calls to specific campaigns using dedicated tracking numbers and Conversions API uploads. The setup and the limitations.
- Marketing6 June 2026 · 8 min read
Call tracking for marketing: prove which channels actually generate inbound calls
Spend on Google Ads, billboards, radio, Meta — and you have no idea which generated phone calls. Call-tracking with multiple inbound numbers fixes that. How it works, what to track, and how to set it up free with Membership.
Compliance · 3
- Compliance17 July 2026 · 8 min read
The 24/7 helpline rule for EV charge points — and the quarterly report nobody warns you about
Under the Public Charge Point Regulations 2023, every UK charge point operator must run a free, staffed 24/7 helpline and file a quarterly report to the government — total calls, the type of help sought, and how long calls took to resolve in 10-minute bands, with no personal data. What Regulation 9 actually requires, where operators get caught out, and how NumberGroup turns the calls you already handle into the return itself.
- Compliance6 June 2026 · 9 min read
TPS and CTPS compliance: how UK businesses avoid cold-calling fines in 2026
ICO fines under PECR can hit £500,000 — and now £17.5m under UK GDPR. What TPS and CTPS actually require, when you can call business numbers, B2B vs B2C rules, and the screening workflow every UK sales team needs.
- Compliance6 June 2026 · 8 min read
Call recording for UK business: why, how, and the GDPR / Ofcom rules
Why UK businesses record calls (training, disputes, compliance, quality), what UK GDPR and Ofcom require, the consent rules that actually apply, and how call recording is included free with NumberGroup Membership.