VoIP Phone Systems that ring wherever your team works
VoIP phone systems carry your business calls over your data network instead of copper phone lines, so one extension can ring a desk phone, a laptop, and a cell phone app at the same time. Granite Tech designs, installs, and supports hosted VoIP and UCaaS platforms for Montana businesses, and we have been in the voice business since 2003, when the company started as Montana Phone.
What a VoIP phone system actually does
VoIP stands for Voice over Internet Protocol. Your voice is turned into small data packets, carried across your network and the internet, and put back together on the other end in a fraction of a second. The phone system itself is called a PBX, short for private branch exchange, and it decides where every call goes: which extension rings, what the auto attendant says, where voicemail lands, and what happens after hours.
That PBX can sit in your server closet, run in a provider’s data center, or live inside a cloud platform that also handles chat and video meetings. Choosing between those three is most of the decision, and we compare them side by side below. VoIP is one part of our business phone systems work, and if you want the terms explained first, our article on PBX vs. VoIP and how they differ covers them in plain language.
A customer dials your main number. The carrier hands the call to your phone system over a SIP trunk, a digital connection that replaces the old bundle of copper lines.
Business hours, holiday schedules, the auto attendant menu, and ring groups decide whether the front desk, a department, or an after-hours greeting picks up.
Packets cross your firewall and switches to reach the phone. If the network does not give voice traffic priority, this is where choppy audio and dropped calls begin.
A desk phone, a softphone on a laptop, or a mobile app on a cell phone, all tied to the same extension, so a missed call at the desk can still be answered from home.
When an old phone system starts costing you calls
Few businesses replace a phone system on the day it dies. They replace it because it slowly stopped fitting the way the team works. These are the patterns owners and office managers describe to us on discovery calls.
The PBX cabinet or the handsets are past manufacturer support, so every failure turns into a search for used parts.
Staff working from home, a job site, or a second office hand out personal cell numbers, and customers lose track of who to call.
Adding a user, moving a desk, or updating the holiday greeting means a service call and a wait.
Copper lines, a maintenance contract, and long-distance charges arrive separately, and nobody has added them up in years.
A second location needs its own system or a costly link back to the first, so each office ends up running as its own phone island.
Calls break up, the phone vendor points at the internet provider, and the internet provider points back at the phones.
Three ways to run a business phone system, side by side
All three use VoIP. The differences are where the phone system lives, who maintains it, and how much more than calling it handles. Pick a column to bring it forward and see where we usually fit.
| Compare | On-premise PBXEquipment you own | Hosted VoIPPhone system in the cloud | UCaaSPhones, chat, and video in one |
|---|---|---|---|
| Where the phone system lives | A PBX appliance or server in your building | The provider’s data centers, reached over your internet connection | A cloud platform that combines phones, messaging, and video meetings |
| Upfront cost | Highest: you buy the PBX, licenses, and phones | Lower: mostly desk phones and any network upgrades | Lower: staff who work from the apps may not need a desk phone |
| Ongoing cost | Maintenance, SIP trunks or lines, and eventual hardware replacement | A monthly cost per phone or seat | A monthly cost per user that usually covers calling, chat, and meetings |
| Updates and upkeep | You or a contracted technician, on your schedule | The provider maintains the platform and applies updates | The provider maintains the platform and applies updates |
| Remote and mobile staff | Possible with softphones and a VPN, with extra setup | Built in through desktop and mobile apps | Built in, with chat, presence, and video in the same app |
| Multiple locations | One system per site, or remote sites linked back to a main PBX | Every office joins one system with extension dialing between sites | Every office and every remote worker on one platform |
| If the office internet goes down | Internal calls keep working; outside calls depend on how your lines connect | Incoming calls can be rerouted to cell phones or another office until service returns | Staff keep taking calls in the mobile app over cellular data |
| Best fit when | The PBX is newer, still supported, and you want calling kept on-site | You want to retire closet hardware and keep a familiar desk phone experience | Your team works hybrid, spans several offices, or already lives in chat and video |
Planning the move off an on-premise PBX
If your system still has useful life, plan the replacement before parts run out, instead of after a failure. Our recommendation is hosted voice on UNIFI360, and many moves are gradual: hosted VoIP for most users while a few analog lines for fax machines, alarm panels, or elevators stay in place and get documented.
- A replacement date picked in advance
- Analog lines inventoried before any cutover
- Desk phones reused only where the new platform supports them
Moving to hosted VoIP
This is the common next step for a business with an aging PBX. The closet hardware goes away, desk phones stay on desks, and the same extensions now ring the desktop and mobile apps too. We check the network first, move your numbers on a date you choose, and train your staff on install day.
- Network tested before phones ship
- Numbers ported on a scheduled date
- One local team for the install and the support
Going to UCaaS with UNIFI360
UNIFI360, our hosted phone system, is a UCaaS platform with calling, messaging, and meetings in one place, plus AI Call Recap, AI Assistant, and AI Receptionist built in. It suits hybrid teams and multi-office businesses that want one app for every conversation.
- Calling, chat, and meetings in one app
- AI features available on the same platform
- Full details on our UCaaS service
The features your team will use every day
Feature lists from VoIP companies run long. These are the ones that change how a front desk, a service department, or a field crew handles calls, and the ones we set up and walk your staff through on install day.
UNIFI360 Hosted Phone System
Calling, messaging, and meetings on one platform, installed and supported by the same Granite Tech team. Three AI features come with it:
The AI Receptionist answers and routes common questions such as hours and directions, which makes it a natural fit for overflow and after-hours calls.
For outbound calls, Branded Caller ID shows your business name, and optionally your logo and the reason for the call, on the mobile phones you call, so more customers pick up.
A recorded menu that answers the main line and routes callers by department, hours, or holiday schedule.
Calls ring a team at once or wait in line for the next person free. High-volume teams can step up to contact center as a service.
Messages arrive in the inbox as audio files, so nobody has to dial in to check a mailbox.
The business number goes with your staff, and their personal cell numbers stay private.
Recorded calls for training, quality review, or record-keeping in regulated work such as financial services.
Every location shares one directory, and calls transfer between offices like a desk across the room.
Your network decides how good the calls sound
Choppy audio, one-way audio, and dropped calls usually trace back to the network rather than the phones. We check these six things before a single phone ships, and because Granite Tech also builds networks and pulls cable, the fix does not depend on a second vendor.
Upload speed and call count
Each call uses bandwidth in both directions, so upload speed and the number of calls at your busiest hour matter more than the advertised download speed.
Voice priority on the network
Quality of service settings on the firewall and switches put voice ahead of file downloads and video streams, which keeps audio clear when the office is busy.
Power for the phones
Desk phones usually draw power from the network switch. Switches with enough power budget, plus battery backup, keep phones up through a short outage.
Cabling to every desk
Phones need a reliable data run at each desk or a shared port with a computer. Our voice and data cabling crews handle the runs when the building needs them.
A second path for the internet
A backup connection or a dedicated internet access circuit keeps the phones working when your main provider has a bad day.
The lines nobody remembers
Fax machines, alarm panels, elevator phones, and gate call boxes often ride on old analog lines. We find them before cutover, not after.
From discovery call to the first ring on the new system
Phone cutovers go wrong when numbers, call flows, or network readiness are left for the last day. Our ten-step process handles all three early. On a VoIP project, it looks like this.
Discover
A 30 to 45 minute call, then an inventory of your numbers, lines, phones, call flows, and analog devices, plus a test of the network that will carry voice.
Propose and plan
A written proposal with scope, pricing, and timelines, then a cutover plan that maps every number, ring group, and after-hours rule.
Stage and test
Phones are configured and tested before install day, and number porting from your current carrier is scheduled for a date you choose.
Go live and onboard
Test calls on every main number, staff training on the desk phones and apps, and a documented handoff to our customer care team.
Cost, cutover day, and what comes after
No two quotes look alike because no two offices are wired, staffed, or called the same way. Here is what drives the number and what to expect once you say yes.
What decides the cost
Voice is priced per phone or seat, so the monthly cost follows your user count. The rest of the quote comes down to a few factors.
- Desk phones vs app-only users
- Call recording, queues, and AI features
- Network or cabling work needed first
- How many locations join the system
Larger multi-site deployments are covered on our enterprise VoIP page.
What to expect on cutover day
Most of the work is finished before it. Phones arrive configured, your numbers move to the new system on the scheduled date, and we place inbound and outbound test calls on every main number before we leave.
Staff get a walkthrough on their own phones and apps: transferring a call, checking voicemail in email, and answering from a cell phone. Questions in the first week go to the same local team.
How long it lasts and what it needs
With hosted VoIP or UCaaS there is no PBX to replace; the provider updates the platform. Desk phones and the switches that power them do have a service life and belong in your refresh plan.
Day to day, upkeep is adding users, moving desks, and changing greetings. Our team handles those and reviews call flows as your business changes.
What a phone conversion feels like from the customer side
VoIP phone system questions, answered
Both carry calls over your data network. With PBX VoIP, the phone system runs on equipment you own in your building, and you maintain it and eventually replace it. With hosted VoIP, the provider runs the phone system in its data centers and you pay monthly per phone or seat. Many businesses with an aging on-premise PBX move to hosted VoIP when the hardware nears the end of its support.
Often, yes, but we test before we recommend anything. Upload speed, how many calls run at once during your busiest hour, and whether your firewall and switches give voice traffic priority matter more than the advertised download speed. If the connection or the network needs work before VoIP phone systems will sound right, the proposal says so up front, with the cost.
In most cases, yes. Numbers move from your current carrier to the new system through a process called porting, which we schedule so the switch happens on a date you choose. Your numbers keep working on the old service until the port completes, so customers can reach you throughout.
Voice is priced per phone or seat, so the monthly cost follows the number of users. The total also depends on desk phones versus app-only users, which features you turn on, how many locations join the system, and whether the network or cabling needs upgrades. After a discovery call you get a written proposal with scope, pricing, and timelines before any work starts.
Yes. Granite Tech has installed and supported business phone systems in Montana since 2003, when the company started as Montana Phone. The same team handles design, installation, staff training, and ongoing support, and you can reach us at 406-505-5061.
Ready to retire the old phone system?
Request a 30-minute call. Bring a recent phone bill and a rough count of users, and leave with a clear read on whether hosted VoIP or UCaaS fits and what the network needs first. A written proposal follows if there is a fit.
Or email CustomerCare@granite.tech