--- title: "Multi-Line Phone System for Small Business: 2026 Guide" description: "How many phone lines does a small business need? Lines vs numbers vs channels, the math, 4 ways to get a multi-line phone system and what they cost." url: https://skipcall.io/en/blog/multi-line-phone-system-small-business language: en last_updated: 2026-11-11 --- [Ask Claude about this article](https://claude.ai/new?q=I'm%20reading%20%22Multi-Line%20Phone%20System%20for%20Small%20Business%3A%20How%20Many%20Lines%20You%20Need%20and%20How%20to%20Get%20Them%22%20\(https%3A%2F%2Fskipcall.io%2Fen%2Fblog%2Fmulti-line-phone-system-small-business\).%20Read%20the%20article%2C%20then%20answer%20my%20questions%20about%20it.) [Ask ChatGPT about this article](https://chatgpt.com/?q=I'm%20reading%20%22Multi-Line%20Phone%20System%20for%20Small%20Business%3A%20How%20Many%20Lines%20You%20Need%20and%20How%20to%20Get%20Them%22%20\(https%3A%2F%2Fskipcall.io%2Fen%2Fblog%2Fmulti-line-phone-system-small-business\).%20Read%20the%20article%2C%20then%20answer%20my%20questions%20about%20it.) LinkedIn X [Back to blog](https://skipcall.io/en/blog) Business phone Published 11 November 2026 # Multi-Line Phone System for Small Business: How Many Lines You Need and How to Get Them A small business does not need one phone line per person. It needs enough simultaneous calls for its busiest hour. The difference between a line, a number, a channel and a device, how to do the math, the four ways to get multiple lines in 2026 and how each one is priced. 3 counts to keep apart: your numbers, your simultaneous calls and your devices. They have no reason to match 4 simultaneous calls are enough for 10 three-minute calls in your busiest hour, with under 1% of calls blocked (Erlang B formula) 90 days of direct notice, at minimum, that an incumbent carrier must give before a planned copper retirement, under FCC rule 47 CFR 51.333 A multi-line phone system for a small business no longer means ordering lines. It means internet-based phone service that gives you the numbers you need and enough simultaneous calls for your busiest hour. For a team of 2 to 20 people, that is usually 2 to 5 conversations at once, not one line per employee. Analog lines, meanwhile, are being retired along with the copper network they run on. You are asking because… A Your customers get a busy signal or voicemail as soon as two people are on the phone at the same time. B You are hiring, and you cannot tell whether each new person needs a number, a line or a phone. C Your carrier is ending your current lines, and you have to replace them without losing your numbers. ## Line, number, channel, device: what is the difference? For a century nobody had to ask. A phone line was a physical thing: two copper wires between the central office and your desk. One conversation traveled on those wires, tied to one number, ringing one phone. Having “three lines” meant three pairs of wires, three subscriptions and the ability to hold three conversations. Internet-based phone service broke that link. Voice travels as data, like an email, and nothing forces a number to match a conversation or a device anymore. Numbers, simultaneous calls, devices: three counts that do not have to match 3 numbers What your customers dial - Main office number - Claire’s direct line - Marc’s direct line 2 simultaneous calls What used to be called “lines”: how many conversations at once - Call in progress - Call in progress 4 devices Where it rings - Front desk computer - Claire’s cell phone - Marc’s cell phone - Conference room phone Made-up example of a four-person office. With internet-based phone service, the number of simultaneous calls is no longer a count of wires: it is a setting, or a cap in your plan. Four words are enough to read any phone quote. **The number.** It is an address: what your customers dial. You can have one for the whole company, one per person, one per department or one per city. A number says nothing about how many calls it can take at once. **The simultaneous call, or channel.** It is capacity: one conversation at a given moment, inbound or outbound. This is the true heir of the word “line”. When a carrier talks about channels or call paths, it means how many conversations you can hold at the same time. **The device, or extension.** It is where the call rings: a desk phone, an app on a computer, an app on a cell phone. One person can have three, and one call can ring on several at once. **The user.** It is the billing unit of most current plans: one person, with their number or numbers and their devices. Read the definition in the quote: for some vendors a user is a person; for others, a device or a simultaneous call. One point of vocabulary, to avoid a common mix-up. In outbound sales, “lines” also means how many numbers a dialer calls at once for a single rep. That is a different subject, covered in our article on [how many lines a parallel dialer should run](https://skipcall.io/en/blog/how-many-lines-parallel-dialer). Here, “lines” means what a business needs to take and place its everyday calls. > You no longer buy lines. You buy numbers so people can find you, and simultaneous calls so they can reach you. ## How many phone lines does a small business need? The instinctive answer is “one per person”. It is almost always wrong, because people are never all on the phone at the same moment. The right question is: during your busiest hour, how many conversations overlap? Three steps answer it with your own numbers. 1. 01 #### Find your busiest hour: Look at two normal weeks of call logs, on your itemized bill or in your current tool. Note the hour of the day when the phone rings most. In many businesses it is late Monday morning; in a store it may be Saturday. 2. 02 #### Count the calls in that hour and how long they last: Add inbound and outbound calls, then work out the average length of a conversation. Ten three-minute calls do not weigh the same as ten fifteen-minute calls. 3. 03 #### Read the number of simultaneous calls off the grid: The grid below shows, for six busy-hour profiles, the share of calls that would find everything taken, by number of conversations allowed at once. Aim for fewer than one blocked call in a hundred. How many lines before callers almost never hit a busy signal? Share of calls that find every line taken during your busiest hour, by number of simultaneous calls allowed. **4 calls in the hour, 3 min each** 3 lines are enough 1 17% 2 1.6% 3 0.1% 4 <0.1% 5 <0.1% 6 <0.1% 7 <0.1% 8 <0.1% **10 calls in the hour, 3 min each** 4 lines are enough 1 33% 2 7.7% 3 1.3% 4 0.2% 5 <0.1% 6 <0.1% 7 <0.1% 8 <0.1% **12 calls in the hour, 5 min each** 5 lines are enough 1 50% 2 20% 3 6.3% 4 1.5% 5 0.3% 6 0.1% 7 <0.1% 8 <0.1% **20 calls in the hour, 4 min each** 5 lines are enough 1 57% 2 28% 3 11% 4 3.5% 5 0.9% 6 0.2% 7 <0.1% 8 <0.1% **30 calls in the hour, 4 min each** 7 lines are enough 1 67% 2 40% 3 21% 4 9.5% 5 3.7% 6 1.2% 7 0.3% 8 0.1% **45 calls in the hour, 4 min each** 8 lines are enough 1 75% 2 53% 3 35% 4 21% 5 11% 6 5.2% 7 2.2% 8 0.8% - __More than 1 call in 10 fails - __Between 1% and 10% - __Under 1%: the usual target Math: Erlang B formula (calls arrive at random, no queue). Assumptions are shown on each row; replace them with your own numbers. The grid uses the Erlang B formula, the standard method carriers use to size lines when calls arrive at random and a call with no free line is lost. It is not a market statistic: it is math, applied to assumptions you can swap for your own. Your profile is not in the grid? Run the same math: multiply the calls in your busiest hour by their average length in minutes, then divide by 60. The result, the traffic, gives the number of simultaneous calls to plan for. Two notes on reading that result. **The formula assumes a call with no free line is lost.** That was true of bundled lines. With a cloud phone system the extra call is not necessarily lost: it can ring a coworker, wait a few seconds or go to a voicemail that alerts you. The math gives you a cautious bound. **The math fits office activity, not a team that is on the phone nonstop.** If six sales reps spend the morning prospecting, six people are on calls at once and you need six possible conversations. Sizing is then done per person, and the choice is about the tool: see our comparison of the [best telesales software](https://skipcall.io/en/blog/best-telesales-software). Our SIP trunk guide gives the general benchmark: in an office business, the share of staff on a call at the same moment usually sits between 15 and 30%, as detailed in the section on [sizing the channels of a SIP trunk](https://skipcall.io/en/blog/sip-trunking). ## How do you get a multi-line phone system in 2026? Four options coexist. They do not suit the same businesses, and one of them is disappearing. | Option | What you buy | Who it fits | The limit | | - | - | - | - | | Analog lines (POTS) | Physical lines, one conversation each | Nobody: they are being retired with the copper network | Carriers are freezing and retiring copper area by area | | SIP trunk on a phone system you own | Channels, meaning simultaneous calls, connected to your equipment | Businesses that already own a recent PBX or have strict hosting requirements | The equipment, its maintenance and its security stay on you | | Cloud phone system | Users, with numbers, auto attendant, ring groups and transfers | Most businesses of 2 to 20 people that need to be easy to reach | Depends on the quality of your internet connection | | App with one number per person | One business number per person, on computer and cell phone | Solo professionals, mobile teams, sales teams | Few or no front-desk features: not always a phone menu or a call queue | ### Analog lines: an option with no future Traditional lines, often called POTS, run on the copper network. Carriers are retiring it in favor of fiber and wireless. The FCC’s network change rules set the notice: an incumbent carrier “must provide direct notice of a planned copper retirement at least 90 days prior to implementation”, or 15 days when the copper serves no customers (source: [47 CFR 51.333](https://www.law.cornell.edu/cfr/text/47/51.333), read November 11, 2026). That notice goes to interconnecting providers and 911 service providers; your own carrier is the one that tells you. In practice, adding an analog line is no longer a real option, and the ones you have carry an end date that depends on your location. The timeline, carrier by carrier, is in our guide to [POTS line retirement for businesses](https://skipcall.io/en/blog/pots-line-retirement-business). Watch for what still depends on those lines without anyone thinking about it: alarm panels, card terminals, fax machines, elevator phones. The day the line is retired, that equipment stops too. ### The SIP trunk: channels for a phone system you own A SIP trunk connects a phone system on your premises to the public telephone network over the internet. You no longer buy lines but channels: each channel is one simultaneous call. Three numbers and four channels, for example, mean your three numbers can take or place four conversations at once, however they are split. This makes sense if you already own a recent, compatible PBX and want to keep it. It makes little sense for a five-person business starting from scratch: the equipment, its updates and its protection against toll fraud remain your job, a risk covered in our guide to [VoIP security and toll fraud](https://skipcall.io/en/blog/voip-security-toll-fraud). How it works, how to size it and what it costs are covered in our [SIP trunking guide](https://skipcall.io/en/blog/sip-trunking). ### The cloud phone system: the most common answer A cloud phone system does the job of a traditional PBX, but at the provider. You install nothing: each person signs in with an app on their computer, their cell phone or a compatible desk phone. In a dashboard you set who rings when a given number is called, in what order, and what happens if nobody answers. This is where “multiple lines” takes its modern form. Your main number can take several calls at once, handed to a group of people. Each employee can have a direct number. And the number of simultaneous calls is no longer a count of wires: it is usually one call per user, sometimes more. The generations of phone systems, the buying criteria and the decision grid by company size are in our [business phone system guide](https://skipcall.io/en/blog/business-phone-system). If your need is mostly the front desk, with a phone menu that routes callers, see also the guide to [IVR](https://skipcall.io/en/blog/ivr-interactive-voice-response). ### The app with one number per person: the lightest option The fourth option is the simplest: a business phone app that gives each person a number, usable on a computer and a cell phone. There is no phone system to configure. Everyone has a business line, separate from their personal number, and calls land in a shared history. It fits solo professionals, teams on the move or working remotely, and sales teams, for whom each person’s direct line matters more than a shared front desk. For a team split between office and home, our guide to a [remote team phone system](https://skipcall.io/en/blog/remote-team-phone-system) covers the setup seat by seat. Its limit is the flip side of its simplicity: depending on the tool, you get no phone menu, no call queue and no fine-grained routing of inbound calls. The idea of a number with no physical line is explained in our article on the [virtual business phone number](https://skipcall.io/en/blog/virtual-business-phone-number), and the steps are in the guide on [how to get a virtual phone number](https://skipcall.io/en/blog/how-to-get-a-virtual-phone-number). ## Multi-line phone system or multi-line desk phones: are they the same thing? No, and the confusion costs money. In American small offices, “multi-line phone system” often still means a set of 2-line or 4-line desk phones that share a few analog lines, with a lit button per line. Each button is one physical line from the carrier. When line 1 is busy, the next call rings on line 2, and anyone can pick it up or put it on hold from their own desk. That design solved a real problem, and it explains two habits that no longer apply. **The habit of counting buttons.** With desk phones tied to analog lines, capacity was visible: four buttons, four calls. With internet-based service, capacity is a setting in your plan. A phone with two line keys can sit on a system that allows ten simultaneous calls, and the reverse. **The habit of rollover.** Carriers used to chain analog lines so a busy first line rolled to the next. A ring group does the same job today, without a line to rent for each step and without a technician to reorder them. If you own that kind of equipment, three questions decide what happens next. - **Does it depend on analog lines?** If the phones plug into wall jacks fed by the carrier’s copper, they stop when those lines are retired. An adapter can keep them alive for a while, but you keep the limits of the old setup. - **Do people use what the phones do?** Shared line buttons, intercom and paging are the features offices miss most. A cloud phone system replaces the first with ring groups and shared call history, and the other two with features you should ask about by name. - **Who actually sits at a desk?** If half the team works from a laptop or from the road, a desk-phone system serves the wrong half. For most offices the honest answer is to keep a desk phone where a shared, always-on device makes sense, and to move everyone else to an app. What you are buying, in both cases, is the same thing: enough simultaneous calls, on the right numbers. ## Main number or direct numbers: how should you split them? Once capacity is settled, you still have to decide which numbers you publish. Three setups cover almost every small business. **A main number only.** Everyone calls the same number, which rings several people. Easy to communicate, right for a store or an office where anyone can answer. Limit: regular customers cannot reach their contact directly. **A main number plus direct numbers.** The main number goes on the website and on quotes; each employee also has a direct line, given to their own contacts. This is the most common setup once people manage their own clients. **Numbers by activity.** One number for sales, one for support, sometimes one per city. Useful to know where a call comes from before you pick up. Keep it for cases where the call really must reach different people. Two settings then make all the difference for the caller. **Ring order.** On a main number, calls can ring everyone at once, or one person and then the next. Ringing everyone answers faster; ringing in sequence keeps five people from stopping work for the same call. **What happens with no answer.** Decide it before you need it: forward to a cell phone, to a coworker, or to a voicemail whose message arrives by email. The four types of forwarding and their traps are in our guide to [call forwarding vs call transfer](https://skipcall.io/en/blog/call-forwarding-vs-call-transfer). A call that rings out is the most expensive flaw of a small business, as our guide to [business call handling](https://skipcall.io/en/blog/business-call-handling) shows. To choose between a local number and a toll-free number, our free [local vs toll-free number tool](https://skipcall.io/en/tools/local-vs-toll-free-number) asks the right questions in two minutes. ## Can several people share one phone number? Yes, and it is the most common case. There are three ways to do it, and they do not feel the same to the caller or the team. 1. 01 #### The ring group: The number rings several people; the first to pick up takes the call. The others see it was answered. It is the simplest form of sharing, and it works on cell phones as well as computers. 2. 02 #### Round-robin distribution: Each new call is offered to the next person on the list. It is used to split inbound requests fairly between several sales reps or technicians. 3. 03 #### The shared inbox: Missed calls, voicemails and texts received on the number land in a space the whole team can see. Anyone can call back, and everyone knows whether it has been done. One thing to check in every plan: when two people call that shared number at the same moment, does the second call ring the coworkers who are free, or does it go to voicemail? That is exactly the question of simultaneous calls, applied to one number. On outbound calls, sharing raises another question: which number shows up on the other person’s phone? A team can place all its calls showing the main number, so callbacks come back to the front desk, or show each person’s direct line. Both are defensible; what matters is deciding, and not letting everyone show a personal cell number. ## Callers get a busy signal: do you need more lines? Not always. Before you buy capacity, look at what the caller actually heard. Five situations look alike from the outside, and only one is fixed by adding simultaneous calls. | What the caller gets | Most likely cause | What to change | | - | - | - | | Busy signal at peak times | Every simultaneous call is taken | Add capacity, after redoing the busiest-hour math | | Voicemail while coworkers are free | The number rings one person only | Create a ring group on that number | | Long ringing, then nothing | No rule set for unanswered calls | Set forwarding or a shared voicemail after a few rings | | Straight to voicemail, at any hour | A forgotten always-on forward, or a device that is off | Check active forwards and the number's business hours | | The call connects but audio is choppy | The internet connection, not the number of lines | Measure the connection before touching the plan | The first row is the only one that costs another subscription. The next three are fixed in a few minutes in the settings, with nothing to buy. The last one is a network matter: our guide to [VoIP call quality problems](https://skipcall.io/en/blog/voip-call-quality-problems) walks through the diagnosis symptom by symptom. ## How much does a multi-line phone system cost? The change of vocabulary changes the bill too. You no longer pay per line, but according to the option you pick. $15-$40 per user per month for a cloud phone system, the range reported in our business phone system guide $1-$5 per extra number per month, past the first one, according to the same guide $25 per user per month, starting price of Skipcall's VoIP plan on annual billing, one number per person What each pricing structure means for a small team: **Per-user pricing (cloud phone system, app).** You pay for each person who makes calls. Adding someone costs one more subscription, with no installation. The trap: paying a full user for a phone that rings three times a month, such as a conference room. **Per-channel pricing (SIP trunk).** You pay for capacity, whatever the headcount. Attractive if many people call rarely. On top of that price comes the phone system on your premises: purchase, maintenance, replacement. **Numbers.** The first number is usually included; the next ones are rented monthly. Ten direct numbers cost a few dollars to a few tens of dollars a month, far from the price of ten lines in the old days. **Usage.** Check what “unlimited” covers: usually domestic calls, rarely international and premium numbers. A business that calls abroad is priced by the minute. The line-by-line breakdown, activation and hardware included, is in our guide to [business VoIP phone service](https://skipcall.io/en/blog/business-voip-phone-service). ## Which option fits which small business? Four typical situations, with what each one really needs. These are examples built to illustrate the method, not customer cases. **The four-person professional office.** Few calls, but each one matters. A main number that rings everyone, four direct lines, forwarding to cell phones outside office hours. Two to three simultaneous calls are plenty. Option: an entry-level cloud phone system. **The store with a card terminal and an alarm.** Two legacy “lines”, one of which nobody uses to talk. Before replacing them, list what is plugged into each. Voice moves to an app or a cloud phone system; the alarm and the terminal have their own replacement paths, to check with their vendors. **The ten-person agency.** Calls arrive in waves, on Monday morning and after every campaign. Work out the busiest hour: 20 four-minute calls need 5 simultaneous calls. A main number that rings in sequence, direct lines for account leads, a shared inbox for messages. **The six-person sales team.** Here everyone is on the phone at once, mostly outbound. You need one possible conversation per person, one number per rep, and a tool that logs calls in the CRM. The subject is no longer the phone system but the calling tool, compared in our guide to the [best VoIP for sales teams](https://skipcall.io/en/blog/best-voip-for-sales-teams). ## Do you still need desk phones? Not necessarily. With internet-based service, the device is a matter of comfort, no longer a technical constraint. - **The app on a computer**, with a headset, suits people who call from their desk. That is a softphone, explained in our article on [what a softphone is](https://skipcall.io/en/blog/what-is-a-softphone). The headset matters more than the computer: see [how to pick the best headset for calls](https://skipcall.io/en/blog/best-headset-for-calls). - **The app on a cell phone** suits people on the move. The business number rings on the personal phone without getting mixed up with it, as our guide to a [business number on a personal phone](https://skipcall.io/en/blog/business-number-on-personal-phone) explains. - **The desk phone** still earns its place at the front desk, in a workshop or in a conference room: a device that is always on and that anyone can pick up. Some services need no app to install at all: the call starts from a browser tab, a setup described in our article on [VoIP vs WebRTC](https://skipcall.io/en/blog/voip-vs-webrtc). Nothing stops you from mixing all three. A call can ring on one person’s computer and cell phone at once; they answer wherever they are. Just check, before buying a desk phone, that it works with the plan you chose. ## Can your internet connection carry several calls? Almost always, yes. A call uses little: our VoIP guide works with roughly 100 kbps per simultaneous call in each direction with an uncompressed codec. Five conversations at once therefore need about 0.5 Mbps, far below what an ordinary business connection provides. What matters is not speed but steadiness: a connection that saturates or drops packets produces choppy audio even with one call. Two free tools let you check before you commit: the [VoIP bandwidth calculator](https://skipcall.io/en/tools/voip-bandwidth-calculator), for the theoretical need, and the [VoIP speed test](https://skipcall.io/en/tools/voip-speed-test), to measure your actual line. Finally, plan for an internet outage. The right answer is automatic forwarding of calls to cell phones, set once and for all; with internet-based lines it takes a few minutes to put in place. ## How do you move from traditional lines to a multi-line system? The order of operations matters more than the technology. Businesses that end up without phones for two days almost all canceled before their numbers had been transferred. 1. 01 #### Take inventory: Numbers, lines, and everything plugged into them, including equipment that is not used for talking. For each number, note who uses it and where it is published. 2. 02 #### Work out your real need: Busiest hour, number of simultaneous calls, the numbers to keep, the numbers to create and the devices per person. 3. 03 #### Choose the option and test it: Start a trial, create a temporary number and place real calls for a few days from your premises, at busy times. 4. 04 #### Request the port of your numbers: The new provider handles it. Do not cancel anything yourself: the port ends the old service for the numbers transferred. Rules and timelines are in our guide to [business phone number porting](https://skipcall.io/en/blog/business-phone-number-porting). 5. 05 #### Set the ring rules before cutover day: Who rings on the main number, in what order, and what happens with no answer. Do it while the old numbers still work. 6. 06 #### Check for two weeks: Review missed calls and voicemails during business hours. That is where a badly set ring group or too little capacity shows up. ## What mistakes should you avoid when adding lines? **Counting one line per employee.** You pay for capacity you will never use, or you refuse a direct number to someone who needs one, because you are confusing numbers with capacity. **Sizing on the average.** The daily average tells you nothing. It is during the busiest hour that your customers hit a busy signal. **Forgetting the lines that do not talk.** Alarm, card terminal, fax, elevator: they sometimes depend on a line nobody has looked at in ten years. **Canceling before porting.** A canceled number can be lost. You request the port first, and the port is what closes the old service. **Letting personal cell phones act as business lines.** The day the person is away or leaves the company, their contacts leave with their number. **Planning nothing for when nobody answers.** Without forwarding or a shared voicemail, the extra call is simply lost, even with enough capacity. ## Where does Skipcall fit? Skipcall makes a phone tool built for teams that make calls, sales teams in particular. For the subject of this article, here is what it does and what it does not do. **What it does.** One number per user, usable from the web app and the mobile app, with numbers available in 23 countries. Each person can be on a call at the same time as the others. Calls are recorded, transcribed and summarized by AI, texts go out from the same number, and everything is logged in HubSpot, Pipedrive, Salesforce or Attio. The VoIP plan starts at $25 per user per month on annual billing, from a single seat. **What it does not do.** Skipcall is not a front-desk phone system: no phone menu, no call queue, no routing of inbound calls between departments. If you need a shared front desk with transfers, a cloud phone system is the right choice. On numbers, you start with new numbers, and Skipcall will soon let you port your existing numbers. It therefore fits the fourth scenario, the team that is on the phone all day, and small organizations where each person handles their own calls. For a team that prospects, the power dialer and the 4-line parallel dialer are included from the Starter plan. Plans and what they include are on the [business VoIP](https://skipcall.io/en/business-voip) page. ## The checklist to copy before you ask for a quote Send these questions to each provider, and compare written answers rather than demos. > We are \[number] people, \[number] of whom make calls every day. During our busiest hour we handle about \[number] calls of \[length] minutes. > > 1. How many simultaneous calls does your plan allow, in total and on a single number? > 2. What do you call a user: a person, a device or a simultaneous call? > 3. How many numbers are included, and what do extra ones cost? > 4. Can one number ring several people, both at once and one after another? > 5. What happens to a call when everyone is already on the phone? > 6. Can we choose the number shown when we call out? > 7. Do you port our current numbers, and how long does it take? > 8. What happens if our internet connection goes down? > 9. Which calls are included, and which are billed by the minute? > 10. Is there a minimum number of users or a contract term? ## What to remember - The word “line” hides three things: a number, a simultaneous call, a device. You choose them separately. - A caller who hits a busy signal does not prove you are short on lines: check ring groups and forwards first. - The need is worked out on your busiest hour. For 10 three-minute calls, 4 simultaneous calls are enough; for 20 four-minute calls, 5. - Analog lines are being retired with the copper network. Check what your carrier has announced for your location. - For a business of 2 to 20 people, a cloud phone system or an app with one number per person covers almost every case. - A team that prospects by phone is sized per person, and its real subject is the calling tool. - Never cancel before your numbers have been ported. Author [Charles Baldet](https://skipcall.io/en/author/charles-baldet) [Charles Baldet on LinkedIn](https://www.linkedin.com/in/charlesbaldet/) CEO & Co-Founder, Skipcall Charles is the CEO and co-founder of Skipcall. A sales commando with over 10 years of experience in B2B SaaS and complex strategic accounts, he has closed major deals with Stellantis, SNCF, RATP and Natixis. A specialist in the PUCCKA and MEDDIC methodologies, Charles regularly teaches sales at HEC's incubator and the Sorbonne. He was ranked among Les Echos' top 10 business angels under 35 in 2020. He also co-founded Getalead (B2B sales agency) and Getlab (SalesTech studio). [See all their articles](https://skipcall.io/en/author/charles-baldet) FAQ ## Frequently asked questions **What is a multi-line phone system for a small business?** A multi-line phone system lets a business handle several calls at the same time, on one number or several. Today that almost always means internet-based phone service, which separates three things: the numbers customers dial, the number of simultaneous calls you can hold, and the devices that ring. For a team of 2 to 20 people, a cloud phone system or an app that gives each person a number covers nearly every case. **How many phone lines does a small business need?** Count the calls in your busiest hour, not your headcount. With 10 three-minute calls in that hour, 4 simultaneous calls keep fewer than one call in a hundred from hitting a busy signal; with 20 four-minute calls, you need 5. These results come from the Erlang B formula, which carriers use to size lines. An office of 5 to 10 people rarely needs more than 3 to 5 simultaneous calls for its inbound traffic. **What is the difference between a phone line and a phone number?** The number is what people dial; the line, in today's sense, is the ability to hold one conversation at a given moment. On the old network a number was tied to one pair of copper wires, so to one conversation. With internet-based service, one number can take several calls at once, and several numbers can share the same pool of simultaneous calls. **Can one phone number have multiple lines?** Yes. A single number can take several calls at once as long as your plan allows more than one simultaneous call on it. The calls are then handed to several people: everyone rings together, or one after another. That is how a cloud phone system works by default, and it replaces the old hunt group of bundled lines. **Are traditional business phone lines going away?** Yes, carriers are retiring the copper network that analog lines run on. FCC rules require an incumbent carrier to give direct notice of a planned copper retirement at least 90 days before it takes effect (47 CFR 51.333). Retirement happens area by area, so the date that matters is the one for your own building. **How much does a multi-line phone system cost?** With a cloud phone system you pay per user, not per line: the range we report in our business phone system guide is $15 to $40 per user per month, with extra numbers often $1 to $5 each. With a SIP trunk you pay per channel, meaning per simultaneous call, and you still own and maintain the phone system on your premises. **Do I need a separate phone line for each employee?** No. You need a way to reach each person, which is not the same thing. You can give everyone a direct number without paying for as many simultaneous calls as you have employees, because people are never all on the phone together. The exception is a team that calls all day, such as sales reps prospecting: there you do count one possible conversation per person. **Can I have multiple lines on one cell phone?** Yes, with a business phone app installed on the phone: it adds one or more business numbers next to the personal number, and calls travel over the internet. It is the simplest way to give a business line to someone who is on the move, with no second phone and no second SIM card. ## A calendar full of meetings starts with a call. [Get started now](https://app.skipcall.io/signup) [Book a demo](https://skipcall.io/en/demo) **No commitment** · Number live in 2 minutes Keep reading ## Related articles [View all articles](https://skipcall.io/en/blog) 01 VoIP ### [Business Phone System: How It Works, What It Costs, and How to Choose in 2026](https://skipcall.io/en/blog/business-phone-system) PBX, IP-PBX, or cloud phone system: the three generations compared, how call routing actually works, 2026 per-user pricing, and a decision grid by company size. 2 Sept 2026 02 Business phone ### [Call Forwarding vs Call Transfer: How to Do Both on Mobile, Landline and VoIP](https://skipcall.io/en/blog/call-forwarding-vs-call-transfer) Call forwarding is set before the phone rings; call transfer happens during the conversation. Here are the four types of forwarding, the codes to dial on Verizon mobile and AT\&T home phone, the GSM standard codes, the iPhone and Android settings, what a forwarded call costs, the traps, and a script for a warm transfer instead of a cold one. Codes checked on November 11, 2026. 11 Nov 2026 03 Business phone ### [Business Number on a Personal Phone: 4 Ways to Run Two Numbers on One Phone](https://skipcall.io/en/blog/business-number-on-personal-phone) Dual SIM, eSIM, a carrier add-on or a business phone app: four ways to put a business number on your personal phone. What each one really separates (calls, texts, voicemail, contacts, hours, the bill), the iPhone and Android settings, and what happens to the number the day you leave the company. 11 Nov 2026 ## Ready to multiply your productivity? Join the sales teams that have transformed their prospecting. [Request a demo](https://skipcall.io/en/demo) Personalized demo • No commitment