VoIP reliability comes from your internet and power, not from the phone system itself.
Put a backup connection and a battery on the router before you blame the phones.
A small office usually loses calls when the data line or the power drops.
Each range below is the published premium price, widened by that vendor's confidence band. State tax is not included, because it depends on where you are. Prices as published by each provider. Data as of 2026-10-04.
A TechEstimate is a range. A written proposal is the number you can hold a provider to.
These phone systems are alphabetical. This is not a quality ranking.
TechlyScore ranks them for your setup when you compare in real time.
123NET: $21 to $39 per user/month. 8x8: $26 to $30 per user/month. Aircall: $35 to $45 per user/month. AireSpring: $24 to $46 per user/month. Allworx (Windstream): $18 to $32 per user/month. AT&T Office@Hand: $26 to $34 per user/month. Avaya Cloud Office: $22 to $28 per user/month. BCM One: $19 to $35 per user/month.
More providers are in the same table. The list stays alphabetical.
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The phone system itself is rarely the weak point. Reliability comes down to your internet connection and your power. A backup connection and a battery on the router remove most of the risk.
Calls in progress drop and new calls cannot reach your desk phones. Most systems let you set a failover rule that sends calls to mobiles automatically. Set that up before you need it.
Each simultaneous call needs around 100 kbps in each direction. Upload matters as much as download, which is why cable connections struggle more than their headline speed suggests. Consistency matters more than raw speed.
Yes. A mobile app places and receives calls using your business number, so your personal number stays private. Calls route over wifi or mobile data.
One number that follows a person, voicemail in your inbox, and the ability to add or remove a seat in minutes. You also stop paying for physical lines you do not use.
Related: cheapest-business-phone-service, free-phone-system-for-small-business, how-to-choose-a-business-phone-system. Glossary: voip, pbx. How to buy.
Data as of 2026-10-04.