Most VoIP providers look much the same on a quote. The differences show up later — when you want to leave, when a route goes bad on a Friday, or when the price that got you through the door quietly changes.
Commercial terms
1. What is the minimum contract term? A rolling monthly arrangement and a thirty-six month one are different products even at the same price. The long one is a bet on the provider still being good in three years.
2. Is there a minimum spend or a minimum top-up? Plenty of “pay as you go” offers carry a monthly floor that turns them into a subscription. Ask directly.
3. How is a call billed? Per second is the honest answer. Per minute with a one-minute minimum can add a fifth to a bill made of short calls without any rate changing.
4. What notice do I get before rates change? Wholesale rates move; that is normal. Moving without notice is not.
Getting out again
5. Do I own my numbers, and will you port them out? The answer should be an unqualified yes. Any hesitation here is the single biggest warning sign on this list.
6. What does porting out cost, and how long does it take? Get it in writing now, while they want your business, rather than later when they do not.
7. Is the equipment locked to you? Provider-locked handsets become landfill the day you leave. Standard SIP devices do not.
Judge a provider by how easy they make leavingProviders who make it hard to go are relying on that instead of on being good. The ones confident in their service have no reason to build a cage.
Quality and support
8. Are these direct routes, and what ASR do they run at? A rate with no quality figures beside it is half an answer. See how routing really decides your costs.
9. Who answers at 5pm on a Friday? Specifically: is it an engineer who can look at a trace, or a first line reading a script? Ask what happens out of hours.
10. What is the escalation path when a route goes bad? Not the SLA document — the actual sequence of what happens and who you speak to.
Security and control
11. What fraud protection is in place, and who pays if it happens? A compromised PBX can run up thousands over a weekend. Ask about spend caps, destination blocking and alerting, and read the clause about liability. See how toll fraud actually happens.
12. Can I see my own CDR and recordings whenever I want? Your call data is yours. If getting a month of CDR means raising a ticket and waiting, that tells you how the relationship will feel.
The pattern to watch for
None of these questions is difficult for a provider who runs a straightforward business. The useful signal is not any single answer — it is whether they answer plainly or start explaining why the question is complicated.
Ask all twelve in one email before you sign, and keep the reply. It is the cheapest due diligence available, and the reply is worth more than the quote.
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