Hosted VoIP versus an on-premise phone system comes down to who owns, runs and fixes the system. With hosted VoIP, a provider runs the system in its data centers and you pay a monthly fee per user. With an on-premise PBX, you buy the equipment, keep it in your building and maintain it. Hosted usually suits offices with remote staff or more than one location, while an on-site system can still make sense if you own a supported one that works.
Both can give you the same desk phones and much the same features. The differences show up in the bill, during an outage, for remote staff and on the day something breaks, and the same federal 911 rules apply to both. If you have already decided to switch, our business VoIP readiness checklist covers what to check first.
What is the difference between hosted VoIP and an on-premise PBX?
The difference is where the phone system lives. An on-premise PBX is a server or cabinet in your building, usually in a telephone room or network closet. It reaches the outside world through lines from a carrier, such as analog lines, a digital circuit or SIP trunks that carry calls over a data connection.
A hosted system, also sold as a cloud phone system or hosted PBX, runs on the provider’s servers. Your phones and apps connect to it over the internet, and the provider looks after the software and the updates.
An on-site system can be VoIP too. An IP PBX in your closet is still on-premise, because you own it and it sits in your building.
| Hosted VoIP | On-premise PBX | |
|---|---|---|
| Where it runs | The provider’s data centers | Your building |
| How you pay | A monthly fee per user, plus phones | Equipment and installation up front, then support and line charges |
| Upkeep | The provider maintains the system | You, or a maintainer you pay |
| Remote users | Usually included through apps | Possible, with extra setup |
| Office internet fails | Calls can go to cell phones or voicemail, if set up in advance | Carrier lines keep working; SIP trunks on that connection do not |
| Office loses power | Desk phones stop; the system keeps answering | The system and phones stop without battery backup |
Which one costs less over the years you will keep it?
Neither is cheaper in every case, because the money moves at different times. An on-premise system costs the most on day one: equipment, licenses, phones and installation. Then come the line or SIP trunk charges, a support agreement, upgrades and, one day, a full replacement.
Hosted VoIP turns most of that into a monthly fee per user. The fee covers the system and its updates, and often the calling plan. You still buy or lease phones, and your internet connection may need an upgrade.
To compare fairly, add up both options over the years you expect to keep the system. Include the costs that hide, like maintenance contracts and the staff time spent on changes. Then ask each provider what happens to the price if you add ten people, or lose five.
What happens to your phones in a power or internet outage?
Every VoIP phone needs power and a working network. The FCC’s guide to VoIP and 911 service warns that VoIP service may not work during a power outage or when the internet connection fails or becomes overloaded. Power is the shared weakness: an on-site IP system and its phones need it just as much.
What differs is the part that keeps working. An on-site system on carrier lines can keep outside calls going through an internet outage, as long as it still has power. A hosted system fails the other way around. Your desk phones go quiet, but the system keeps running elsewhere and can send calls to cell phones or voicemail, if that is set up in advance.
Say a summer thunderstorm knocks out power to an office park in Plymouth Meeting for the afternoon. With hosted phones and forwarding in place, your staff still take customers’ calls on their cell phones. With an on-site system and no battery backup, callers may get no answer until the power returns. If your desk phones draw power from a network switch, that switch needs battery backup too.
Which works better for remote staff and a second location?
This is where hosted business phone systems have the clearest edge. An extension can ring on a desk phone, a laptop and a mobile app, wherever the person is working. A second office is simply more phones on the same system.
An on-site PBX can serve home workers and other sites, but it takes more equipment and setup. Remote extensions connect back through the office internet, so when that connection drops, home workers lose their extensions too.
Take a firm with offices in West Chester and Cherry Hill and two people who work from home. Hosted gives them one directory and one main number. On-site, the firm needs two linked systems or remote connections into one of them.
Who maintains each system, and who do you call when it breaks?
With an on-premise system, the upkeep is yours: security updates, configuration backups, failed parts and every change when people join, leave or move desks. A maintainer can do the work, but the system and its risks stay yours. Makers also stop supporting older models in time.
With hosted VoIP, the provider maintains the platform. You are still responsible for the cabling, switches, Wi-Fi, phones and internet connection. Every call crosses them first, so the office network has to be ready before the phones move onto it. For a new building, our post on structured cabling for new commercial buildings covers that planning.
Either way, ask who picks up when the phones are down, and whether that means a help line or a technician who comes to your office.
What do federal 911 rules require from a business phone system?
A system installed now must be set up so that anyone can dial 911 directly, with no 9 or other prefix first. It must also alert a central point where someone is likely to see or hear it, such as a building security desk, when a 911 call is made. Those two duties come from Kari’s Law. A second law, RAY BAUM’S Act, covers location: as far as is technically feasible, each 911 call should carry a dispatchable location, meaning the street address plus details such as the floor or suite. The FCC’s page on Kari’s Law and RAY BAUM’S Act summarizes both.
The rules apply to hosted and on-site systems alike, with some exceptions. The FCC’s compliance guide to the rules says they cover the full range of networked systems that serve businesses, including IP-based and cloud-based ones.
Location takes the most planning. A desk phone on the third floor can carry a fixed address, but a laptop app at a kitchen table cannot. Ask your installer how each phone’s location is set and updated, and who receives the 911 notification. This is general information, not legal advice; for your own system, start with the FCC’s guidance or your attorney.
When does keeping an on-premise system still make sense?
Hosted is not right for every office. Keeping or buying an on-site system can make sense when:
- You own a supported system that works and is paid for.
- Internet service at your site is unreliable, and nothing better is available.
- In-house staff already run the system well.
- Your current system drives equipment, such as overhead paging, that a hosted service may not handle the same way.
- Your team is large and stable, so per-user fees could outrun the cost of owning over the life of the system.
There is a middle path too. If your system supports SIP trunks, you can move its outside lines to them and keep the equipment you own. Whatever you decide, ask your carrier how long it plans to keep supplying the type of line your system uses.
Does Logic LC install and support hosted VoIP?
Logic LC provides hosted VoIP business phone systems in the Philadelphia area, with professional installation and configuration, remote and mobile calling, and room to add users and extensions. After installation, Logic LC can handle the equipment, maintenance, updates and ongoing support, whether the job starts with an outdated system or a growing team.
The phones also depend on the cabling, whichever kind of system you choose. Logic LC installs, traces, repairs and replaces structured cabling for analog, digital and IP-based telephone systems. Logic LC also prepares cabling for VoIP deployments, office relocations and telephone-system upgrades.
Where do you start if you are still undecided?
Start with the system you have. Find its make and model, ask whoever maintains it whether the maker still supports it, and note when your line and maintenance contracts end. Those dates often set the timetable for you.
Then count the people: who needs an extension, who works away from the office, and which calls can never go unanswered. Put that beside an honest record of how often your internet connection drops, then read the table above again. If it points to hosted, the readiness checklist is the next step. If it does not, put a date in the calendar to look again before your system’s support ends.
