“How much is this going to cost?” is the first question every business owner asks about a new phone system, and the honest answer is “it depends.” That is not a dodge. The price of a business phone system in Connecticut ranges from a modest monthly fee to a significant capital purchase, and the right number for your company depends on how many people you have, how you use your phones, and what is already in your walls.
This guide breaks down what goes into the cost so you can read a quote with confidence. The figures below are typical ranges as of 2026 and are meant for planning, not as a price list. For an exact number, request a quote and we will put one together for your building.
The two pricing models
Almost every business phone system falls into one of two models, and they are priced very differently.
Cloud (hosted VoIP): pay monthly per user
With a hosted VoIP system, you pay a monthly subscription for each user or extension, typically in the range of $20 to $35 per user per month depending on the feature tier. That fee usually includes unlimited domestic calling, voicemail-to-email, an auto-attendant, mobile and desktop apps, and the maintenance of the system itself.
The main upfront cost is the phones. A good-quality desk phone runs roughly $100 to $250 each, though many providers offer them on a lease or include them at higher plan tiers. Employees who only use the mobile or desktop app need no hardware at all.
On-premises PBX: buy the system, own it
An on-site Avaya PBX system is a capital purchase. You buy the control unit, licenses, and phones, and the system lives in your building. All-in installed cost commonly lands somewhere between $500 and $1,000 per user for a mid-sized deployment, with larger systems benefiting from economies of scale. After that, ongoing costs are the phone lines or SIP trunks (often $15 to $30 per line per month) and a maintenance agreement.
Over a five- to seven-year lifespan, an on-premises system often costs less per user than cloud for organizations with many employees and heavy call volume. For a 10-person office, cloud is almost always cheaper. The crossover point is different for every business, which is why we walk through both options in cloud PBX vs. traditional PBX.
The costs most quotes leave out
The per-user price gets all the attention, but it is rarely the whole picture. When comparing quotes, make sure each one addresses the following.
Installation and programming
Someone has to configure call flows, build the auto-attendant, set up ring groups, program every phone, and port your existing numbers. On a cloud system that may be included or billed as a one-time setup fee. On a PBX it is a meaningful line item. Ask whether staff training is included, because a system nobody knows how to use is an expensive one.
Network cabling
VoIP phones need a network jack at every desk, and the wiring behind it has to be up to the job. Buildings with old Cat5 wiring, unlabeled runs, or too few drops usually need network cabling work before the phones go in. A new Cat6 drop typically costs in the range of $150 to $300 installed, depending on distance and building construction. It is the most commonly overlooked cost in a phone system project, and the most common cause of “the new phones sound terrible.”
Internet bandwidth
Cloud phones share your internet connection with everything else. A busy office may need to upgrade its internet plan or add a dedicated circuit for voice. Budget for this if your current connection is already strained.
Network equipment
Voice traffic needs a router and switches that can prioritize it. Consumer-grade equipment often cannot, and Power over Ethernet switches are needed to power the phones without a wall adapter at every desk. These are one-time costs but they are real.
Number porting and carrier fees
Moving your existing phone numbers to a new provider is usually inexpensive, but it takes time and paperwork. Check for early-termination fees on your current phone contract before you commit to a switch date.
Ongoing support
Cloud subscriptions include support from the provider, but that support is typically a help desk, not a technician at your door. Many businesses keep a local partner for on-site help. For on-premises systems, a maintenance agreement is essential and should be priced into the comparison. See our Avaya maintenance page for what that looks like.
Three sample scenarios
To make this concrete, here is roughly how the numbers shape up for three typical Connecticut businesses. These are illustrations, not quotes.
- 8-person professional office, existing Cat6 wiring. Cloud system with desk phones for six people and app-only for two. Expect a few hundred dollars per month in subscription fees plus a one-time cost for phones and setup. On-premises would rarely make sense here.
- 30-person company, two locations, older wiring at one site. Cloud is still likely the better fit, but the older site needs a cabling refresh and a PoE switch before installation. The cabling may be the largest single line item in the project, and it is worth every dollar.
- 120-person organization with a call center and reliable fiber internet. This is where an on-premises Avaya PBX often wins on total cost over five years. The upfront purchase is substantial, but the monthly cost per user drops well below cloud pricing, and the organization gains full control of the system.
How to get an accurate quote
A trustworthy quote starts with a site visit, not a phone call. The installer should count desks, inspect the wiring closet, check your internet, and ask how your team actually uses the phones. Any quote produced without that is a guess.
When you compare quotes, line them up on total cost over five years, including cabling, equipment, setup, subscriptions or lines, and support. A low per-user price with an expensive install is not a bargain.
Get a real number for your business
Tricom Systems has installed and supported business phone systems across New Haven County and Connecticut for over 20 years. We offer both cloud and on-premises options, so our recommendation is based on what fits your business, not on what we happen to sell. Call 203-306-1950 or contact us for a free site assessment and a quote you can actually compare.