Introduction
She had the sales call confirmed for 10am. Dialled in from the hotel lobby in Singapore, laptop open, headset on.The client in Toronto picked up on the first ring. They talked for 40 minutes. The deal moved forward.Her phone? A VoIP number on her laptop. No SIM card. No roaming charges. No desk phone shipped from HQ. Just internet, an app, and a business number that followed her to the other side of the world.
Key Takeaways
- A VoIP phone makes calls over the internet instead of a traditional phone line — and works on any device you already own.
- Businesses that switch to VoIP cut phone costs by 30–75%, with small businesses on usage-based plans saving up to 68%.
- There are 3 types of VoIP phones: hardphones (desk devices), softphones (apps), and virtual VoIP numbers that need no hardware at all.
- VoIP phone systems come with features — call forwarding, voicemail-to-email, call recording — that traditional landlines charge extra for.
- Twiching gives businesses a VoIP phone number across 190+ countries — local, virtual, vanity, or second number — backed by Singapore infrastructure.
That’s what a VoIP phone actually is — not a piece of hardware, but a way of making calls that works wherever you have internet. And in 2025, over 60% of businesses have already made the switch from traditional phone lines.
This guide covers exactly how VoIP phones work, which type fits your situation, what features matter, and how Twiching’s Singapore-backed platform gives you a VoIP number — local, virtual, or vanity — in minutes, without buying any hardware.
Twiching gives your business a VoIP phone number across 190+ countries — no desk phone, no hardware, no waiting.
What Is a VoIP Phone?
A VoIP phone is any device or application that makes phone calls over the internet rather than a traditional copper phone line. VoIP stands for Voice over Internet Protocol — the technology that converts your voice into digital data, sends it over the internet, and reassembles it as audio on the other end.
The result sounds like a normal phone call. The underlying technology is completely different — and significantly cheaper, especially across long distances and international borders.
Traditional phone calls hold a dedicated circuit open between two points for the entire call. VoIP breaks your voice into data packets, sends them over the internet alongside all other traffic, and reassembles them at the destination. Internet data doesn’t charge by distance. That’s why a VoIP call to Germany costs the same as a call next door.
What Is a VoIP Phone Number?
A VoIP phone number is a phone number assigned to a VoIP service rather than a physical SIM card or landline. It works like any other number — people can call it, you can call from it, it accepts SMS on most platforms — but it’s tied to the internet, not a location.
That matters for businesses. A VoIP phone number can be a local number in any city (making you look local to clients there), a virtual number that routes to wherever your team sits, a vanity number built around your brand, or a second number on your existing phone for business-personal separation.
Twiching offers all 5 number types — local, virtual, vanity, business, and second number — across 190+ countries, managed from one Singapore-backed platform.
How Does a VoIP Phone Work?
The process happens in milliseconds — fast enough that the call feels instant. Here’s what’s actually happening:
Step 1 — Voice capture: When you speak, your device’s microphone captures audio. An analog-to-digital converter (ADC) samples that audio thousands of times per second and converts it to binary data.
Step 2 — Packetisation: The digital audio is broken into small data packets. Each packet contains a chunk of your voice and routing information (where it’s going, what order it fits in).
Step 3 — Transmission over SIP/RTP: Two protocols manage the call. SIP (Session Initiation Protocol) sets up, manages, and ends the call session. RTP (Real-time Transport Protocol) carries the actual voice packets, ensuring they arrive in sequence and on time.
Step 4 — Reassembly: On the recipient’s end, the packets arrive, get sorted into the correct order, and a digital-to-analog converter (DAC) turns them back into audio. The other person hears your voice.
The whole process requires roughly 64–100 kbps of bandwidth per active call — a fraction of a standard broadband connection. Most business internet connections handle 10–20 simultaneous VoIP calls without impacting other traffic.
The 3 Types of VoIP Phones — Which One Do You Need?
1. Hardphones (IP Desk Phones)
A hardphone is a physical VoIP device that sits on a desk. It looks like a traditional office phone but connects to your network via Ethernet (or Wi-Fi) rather than a phone line. It runs SIP protocol directly and connects to your VoIP system without needing a computer.
Hardphones suit office environments where staff are desk-based, where call volume is high enough that a dedicated device makes operational sense, and where familiarity with physical phone hardware matters. They typically offer programmable keys, a physical keypad, and conference speakerphone capability.
The tradeoff: hardphones are hardware. They cost money upfront, need to be provisioned and maintained, and don’t travel. A remote worker or travelling sales rep can’t take their desk phone.
2. Softphones (VoIP Apps)
A softphone is a VoIP application running on a computer, smartphone, or tablet. It turns any internet-connected device into a VoIP phone — same number, same features, same call quality — without any physical hardware beyond the device you already own.
67% of mobile workers report increased productivity with VoIP softphone systems. The reason is straightforward: calls, voicemail, call history, and contacts all travel with the device. A remote team member in another country answers business calls on their laptop as if they were at the office.
Most businesses running distributed or remote teams use softphones as their primary VoIP solution. Lower cost, zero hardware logistics, and works across every device type.
3. Virtual VoIP Numbers (No Hardware Required)
This is the angle most VoIP guides miss. A virtual VoIP number isn’t tied to a device at all — it’s a phone number that routes calls to wherever you specify: a mobile number, a softphone app, a team queue, or an IVR menu.
You don’t need a desk phone. You don’t need a specific app installed. The number exists in the cloud and delivers calls to whatever destination you configure.
This is how a Singapore-based business can have a London number that rings their sales team’s existing mobiles. Or a New York number that routes to a remote support team across three time zones. The number looks local. The team can be anywhere.
Twiching’s virtual number platform gives businesses local, virtual, vanity, and second phone numbers across 190+ countries — routed however the business needs, managed from one dashboard.
VoIP Phone Features That Actually Change How You Work
Traditional phone systems charge extra for features that VoIP includes as standard. Here’s what matters:
Call forwarding and routing: Route incoming calls to any number, device, or team queue — based on time of day, caller ID, or agent availability. An after-hours call to your main number forwards to an on-call mobile. A VIP client’s call routes directly to their account manager. Traditional PBX systems charge for this configuration; VoIP platforms include it.
Voicemail-to-email: Missed calls generate an audio file sent to email — readable in any inbox, playable on any device, searchable and archivable. Workers using unified messaging save up to 43 minutes daily compared to traditional voicemail systems.
Call recording: Record calls for quality assurance, training, or compliance — stored in the cloud, accessible from the dashboard, with configurable retention policies. Regulated industries (finance, legal, healthcare) can enforce call recording as a compliance requirement without separate hardware.
Auto-attendant (IVR): A VoIP auto-attendant answers calls, plays a menu (“press 1 for sales, press 2 for support”), and routes to the right team. Businesses that previously needed a dedicated receptionist for call routing handle it with configuration, not headcount.
Call analytics and CDRs: See every call — origin, destination, duration, outcome — in real time. Identify peak call times, measure team response rates, track international call costs by destination. Data that traditional phone systems either don’t expose or charge extra to access.
VoIP + SMS in one platform: The best VoIP platforms combine voice calling with SMS capability — bulk SMS, SMS API for integration into business applications, and two-way messaging from the same number customers call. Twiching’s three-pillar model (phone numbers + voice + messaging) gives businesses all three without managing separate providers.
Get a VoIP phone number — local, virtual, or vanity — in 190+ countries. Twiching sets it up without hardware or long provisioning waits.
How Much Does a VoIP Phone System Cost?
Businesses that switch to VoIP save 30–75% on phone costs compared to traditional systems. Small businesses on usage-based VoIP plans report savings up to 68%. The source of those savings is structural, not just pricing:
No per-distance pricing: VoIP routes calls over internet infrastructure. International calls to Germany or Canada cost the same as domestic calls. Traditional carriers charge by distance; internet data doesn’t work that way.
No hardware installation costs: A traditional PBX system requires physical installation, dedicated lines, and ongoing hardware maintenance. A VoIP system runs on existing internet infrastructure. The setup cost difference is significant — especially for businesses with multiple locations or remote teams.
No per-feature pricing: Call recording, auto-attendant, call forwarding, and analytics are bundled into VoIP plans. Traditional carriers charge separately for most of these. The actual feature-to-cost comparison consistently favours VoIP once you account for what you’re actually getting.
Scales without linear cost increase: Adding a team member to a traditional phone system means a new physical line, installation fees, and provisioning time. Adding them to a VoIP system is a dashboard configuration — minutes, not days, and at a fraction of the cost.
VoIP Phone vs Traditional Landline: The Honest Comparison
| Factor | Traditional Landline | VoIP Phone |
|---|---|---|
| International call cost | High — charged by distance and duration | Low — internet routing removes distance premium |
| Hardware required | Yes — physical lines and desk phones | No — works on any internet-connected device |
| Setup time | Days to weeks for physical installation | Hours — configure in dashboard, activate same day |
| Scalability | Each new line requires physical provisioning | Add users in minutes — no hardware, no installation |
| Features included | Basic — extras charged separately | Advanced — call recording, IVR, analytics, voicemail-to-email bundled |
| Works remotely | No — tied to physical location | Yes — same number, anywhere with internet |
| Number flexibility | Fixed local number | Local, virtual, vanity, or second number — any country |
| Reliability when internet fails | Continues working | Requires internet — mobile fallback recommended |
The one genuine advantage landlines hold: they work when internet goes down. The fix for VoIP is simple — configure call forwarding to a mobile number as a fallback. Calls still reach you even when your primary connection is unavailable. For businesses in locations with consistent, high-quality internet, this is rarely a practical concern.
VoIP Phone for Business: 4 Use Cases That Show the Real Value
1. International Business — Local Numbers in Every Market
A business operating across multiple countries doesn’t need a physical office in each market to have a local presence. A local VoIP phone number in London, New York, or Singapore — routed to a central team — means clients in each market call a local number. Local numbers get answered at significantly higher rates than unknown international ones. That call answer rate difference directly impacts revenue.
2. Remote and Distributed Teams
A team distributed across 4 countries can share one business number, with calls routed to the right person based on availability, time zone, or skill. Every team member uses a softphone on their existing laptop or mobile. No hardware to ship. No location dependency. The business number follows the team.
3. Brand-Memorable Vanity Numbers
A vanity VoIP phone number — built around your brand name or service — is a marketing asset that traditional carriers rarely offer. Customers remember it. It appears on advertising, business cards, and websites. It routes exactly like any other VoIP number — to your team, to a queue, to an IVR — while reinforcing your brand on every call. Twiching is one of the few providers that offers vanity numbers as a standard product.
4. Work-Life Separation Without a Second Device
A second VoIP phone number on your existing mobile keeps business and personal calls separate — without carrying two phones or managing two SIM cards. Business calls come through on the VoIP number, logged and managed through the business system. Personal calls stay on your personal number. When work hours end, you can pause the business number without touching your personal line.
How to Set Up a VoIP Phone — Simpler Than You Think
Setting up a VoIP phone system doesn’t require IT expertise or an installation appointment. Here’s the realistic process with a provider like Twiching:
Step 1 — Choose your number type. Decide whether you need a local number (for a specific city or country), a virtual number (routable anywhere), a vanity number (brand-memorable), or a second number (privacy separation). This determines what you’re activating, not how it’s installed.
Step 2 — Configure routing. Tell the system where to deliver calls — a softphone app, a mobile number, a team queue, or an IVR menu. This is a dashboard configuration, not a technical setup. Most businesses complete it in under 30 minutes.
Step 3 — Choose your VoIP device. If you’re using a softphone (recommended for most businesses), install the app on your computer or mobile. If you’re adding a hardphone, provision it to your VoIP account via SIP credentials. If you’re using a virtual number with call forwarding, no app or device setup is needed at all.
Step 4 — Test and activate. Make a test call, verify call quality, confirm routing works correctly, and go live. For most setups, this process takes hours — not the days or weeks that traditional phone line provisioning requires.
The Bottom Line
She closed the deal from a hotel lobby in Singapore because her VoIP number worked exactly like an office phone — on her laptop, through the internet, with no roaming fees and no hardware to carry.
That’s what VoIP phones deliver in practice: the ability to call and be called professionally from any device, anywhere with internet, using a number that fits your business rather than your physical location.
The VoIP market is now worth $169 billion globally and growing — because the case for switching is straightforward. Costs drop 30–75%. Features improve. Hardware dependency disappears. And the number works wherever your business operates.
Twiching gives businesses 5 VoIP phone number types — local, virtual, vanity, business, and second number — across 190+ countries. Voice calling, bulk SMS, and SMS API on one Singapore-backed platform. No hardware required. Numbers activated same day.
