Start with the price spread
Starting prices across the business phone systems here sit in a narrow band, with entry points running €13.15 to €65.77. The spread is narrow, which is why the small print matters more than the headline number: a low starting figure often belongs to the smallest plan, with charges layered on top as usage grows.
Read every price as the price of an entry plan, then look at what that plan includes. Aircall lists a starting price of $30 for small-business and enterprise buyers. Nextiva starts at $15 and is built for small-business and enterprise use. Dialpad starts at $27, serving small-business and enterprise callers. Vonage starts at $19.99.
KrispCall gives you more than one figure. Its starting price is $15, its per user starting price is $15, and it spreads across the tiers of Essential, Standard, Enterprise. A per user figure is the one to multiply by your headcount, so it is the number that decides your actual bill. Sort the business phone systems rankings by that figure rather than by the advertised entry price.
Compare limits and quotas before features
A starting price rarely tells you what you can use. KrispCall states that usage charges apply, which is the quietest warning sign in this group: the base price buys the seat, not the call volume.
Nextiva sets a messaging allowance of 100 SMS per user per month on Core. If your team texts customers every day, that cap decides whether the plan survives a busy month. Aircall limits its AI voice agents to 50 min AI Voice Agents per month, so automation work carries its own ceiling on top of calling time.
Write your own usage profile before you read another price: typical call length, message volume per user, automation tasks per month, and your peak hour. Then hold each limit against that profile. A limit that suits a small team can be the wrong plan for a busy sales floor.
Match the product type to the job
Not every system does the same job. KrispCall is a voip system aimed at small-business teams, and Vonage is also voip. Dialpad pairs voip and chatbot. Aircall pairs voip and automation, so automation is a bigger part of the pitch there.
Nextiva is the broadest of the group at voip, chatbot and video, which suits an operation that wants voice, chat and video handled by one vendor. If you only need calling, a narrower product may cost less and be easier to run. Decide which of these you need, then discard the systems that do not offer it.
Free plans, trials and how you commit
None of the brands here offers a free plan, so budget for a paid seat from day one. Aircall, Dialpad and Vonage do let you test before paying: Aircall and Dialpad list a free trial and free trial, and Vonage publishes a free trial running 14.
A trial tells you how the handset, queue and reporting feel in your own office. It does not tell you what your bill looks like once real call volume lands, so use the trial to check the workflow and the price page to check the maths.
Weigh integrations and support
Integrations decide whether the system fits the rest of your stack. Aircall lists 250 integrations, while Vonage lists 20. Count the tools you already rely on, then confirm each one is on the list rather than assuming compatibility.
Support varies sharply. Nextiva offers email, chat and phone, which includes a person on the phone. Dialpad lists email, chat and phone only as help centre, so self-service carries more of the load there. If your staff are not confident with new software, the support list deserves real weight in the decision.
Check who is behind the service
A phone system is infrastructure, so the vendor behind it matters. Dialpad was founded in 2011 and is headquartered in US, trading as Dialpad, Inc.. Nextiva was founded in 2008 and is also headquartered in US. A long operating history is a fair reason to expect a stable product, though it is not a promise of anything.
Audience fit narrows the field too. KrispCall and Quo both target small-business buyers, with KrispCall built around small business and Quo around small business. Aircall, Nextiva, Dialpad and Vonage each cover small business and enterprise, so they suit larger rollouts as well. Buying a system pitched above your size usually means paying for capability you will not use.
Turn the shortlist into a decision
Score each candidate on the same four columns: price at your headcount, limits that fit your usage, features you actually need, and support you can reach. Drop anything that fails a limit test, then compare the survivors on price per user.
Read the individual write-ups before you commit: the KrispCall review, the Nextiva review, the Aircall review, the Vonage review, the Dialpad review and the Quo review each cover how a system behaves in daily use. Use them alongside the business phone systems rankings and run a trial with your own call flow before signing a long contract.