999 calls over VoIP: the part of the switch-off nobody plans for
Emergency calls behave differently on VoIP than on a copper line. What changes, why the address on your account matters, and what to check before you move off ISDN.
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Notes from the network
Practical writing on UK VoIP — how routes, numbers, PBX platforms and security actually behave once real traffic hits them. No vendor waffle.
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Failover: making sure a broadband outage does not take your phones with it
The objection to VoIP is that it dies with the internet connection. It only does if nobody configured what happens next. The four layers of failover, and where to start.
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Call recording in the UK: what you have to tell people
Recording business calls is legal in the UK, but only on terms. What notification actually requires, how long you may keep recordings, and the parts people most often get wrong.
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SIP response codes: what 403, 404, 480 and 503 are really telling you
A failed call always comes with a number attached. What each of the common SIP response codes means in practice, who is responsible for it, and what to check first.
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How many SIP channels do you actually need?
Channels are concurrent calls, not staff. How to size a SIP trunk from your own call data, what happens when you run out, and why buying per-head wastes money.
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The UK PSTN switch-off: what actually changes for your phone lines
Analogue and ISDN lines are being retired across the UK. What is genuinely affected, what is not, and how to move a phone system across without a bad week.
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Pay As You Go VoIP: what it really means
Pay As You Go sounds simple, but providers define it very differently. Here is what to check in the small print before you move your calls.
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Porting UK numbers: how it works and what goes wrong
Moving a phone number between UK providers is routine when the paperwork matches and painful when it does not. The process, the timescales and the five common rejections.
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Why VoIP calls sound bad — and how to tell which problem you have
Choppy audio, one-way calls, robotic voices and echo all have different causes. A practical guide to identifying which problem you actually have.
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G.711, G.729 and Opus: which codec, and why it matters
A codec decides how your voice is compressed before it crosses the network. What each of the three common ones costs you in bandwidth and quality, and when to use which.
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How toll fraud actually happens — and what stops it
Toll fraud costs UK businesses real money every year. Here is how attackers get into a PBX, why it usually happens at the weekend, and what genuinely stops it.
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Asterisk on-premises or in the cloud?
Where should your Asterisk PBX live? A practical comparison of on-premises and cloud deployment across cost, resilience, control and remote working.
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Least cost routing, and why the cheapest rate is not the cheapest call
How wholesale voice routing really works, what a rate sheet does not tell you, and the quality figures that decide whether a cheap route costs you money.
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Twelve questions to ask before signing with a VoIP provider
The questions that separate providers who will still be useful in a year from ones that look cheap on the quote. Contract terms, support, portability and what happens when it breaks.
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Seven rules for an IVR your callers will not hate
Most phone menus frustrate callers because nobody mapped real call reasons before building the tree. Seven practical rules for IVR design that shortens calls.
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Geographic or mobile? Choosing the right UK numbers
UK geographic numbers, mobile DIDs, 0800 and 03 ranges all signal something different to callers. How to choose the right number for your business.
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