You need a minimum of 100 Kbps (0.1 Mbps) upload and download speed per concurrent VoIP call for acceptable quality, but we recommend at least 500 Kbps (0.5 Mbps) per call for HD voice quality. For a typical small business with 5-10 simultaneous calls, you should have at least 5-10 Mbps dedicated bandwidth for VoIP, on top of your other internet usage.
Here's everything you need to know about internet requirements for VoIP, broken down by team size, call type, and quality level.
Quick Answer: Speed Requirements by Team Size
| Team Size (Concurrent Calls) | Minimum Speed | Recommended Speed |
|---|---|---|
| 1 call | 0.1 Mbps | 0.5 Mbps |
| 3 calls | 0.3 Mbps | 1.5 Mbps |
| 5 calls | 0.5 Mbps | 2.5 Mbps |
| 10 calls | 1 Mbps | 5 Mbps |
| 25 calls | 2.5 Mbps | 12.5 Mbps |
| 50 calls | 5 Mbps | 25 Mbps |
| 100 calls | 10 Mbps | 50 Mbps |
Important note: These numbers represent bandwidth needed ONLY for VoIP. Your total internet speed must also account for web browsing, email, CRM usage, file downloads, and other business activities happening simultaneously.
Total Internet Speed Recommendation (VoIP + Everything Else)
| Team Size | VoIP Only | Other Business Use | Total Recommended |
|---|---|---|---|
| 1-3 people | 1.5 Mbps | 10 Mbps | 25 Mbps |
| 5-10 people | 5 Mbps | 25 Mbps | 50 Mbps |
| 10-25 people | 12.5 Mbps | 50 Mbps | 100 Mbps |
| 25-50 people | 25 Mbps | 100 Mbps | 200 Mbps |
| 50-100 people | 50 Mbps | 200 Mbps | 500 Mbps |
| 100+ people | 100+ Mbps | 400+ Mbps | 1 Gbps |
Understanding VoIP Bandwidth in Detail
What Uses Bandwidth in a VoIP Call?
When you make a VoIP call, your voice is:
- Captured by your microphone
- Digitized (converted from analog to digital signal)
- Compressed using an audio codec
- Packetized (broken into small data packets)
- Transmitted over the internet
- Received by the other party
- Decompressed and played through their speaker
Each of these steps requires bandwidth, but the codec (compression algorithm) determines exactly how much.
Bandwidth by VoIP Codec
| Codec | Audio Quality | Bandwidth Per Call | Best For |
|---|---|---|---|
| G.711 | Excellent (toll quality) | 87 Kbps | High-quality with plenty of bandwidth |
| G.722 | Excellent (HD voice) | 80 Kbps | HD voice calls, modern VoIP |
| G.729 | Good (compressed) | 32 Kbps | Low bandwidth situations |
| Opus | Excellent (adaptive) | 6-510 Kbps | Adaptive quality, modern platforms |
| iLBC | Good | 27-38 Kbps | Low bandwidth, Google systems |
| SILK | Very good | 36-64 Kbps | Skype/Microsoft systems |
| Speex | Good (open source) | 24-44 Kbps | Open-source applications |
Most modern VoIP platforms (including CallOrbit) use G.722 or Opus codecs for the best balance of quality and efficiency.
Upload vs. Download Speed
VoIP calls require BOTH upload AND download bandwidth because you're simultaneously sending and receiving audio:
| Direction | What It Does | Required Speed |
|---|---|---|
| Download | Receives the other person's voice | Same as upload |
| Upload | Sends your voice to the other person | Same as download |
This is critical because most internet plans have asymmetric speeds — download is much faster than upload.
Example:
- Your internet plan: 100 Mbps download / 10 Mbps upload
- VoIP bottleneck: Upload speed (10 Mbps)
- Maximum concurrent HD calls (upload-limited): ~125 calls
Always check your UPLOAD speed. It's usually the limiting factor for VoIP.
Beyond Speed: Other Network Factors
Internet speed alone doesn't guarantee good VoIP quality. Three other factors matter just as much:
1. Latency (Ping)
| Latency | Call Experience |
|---|---|
| Under 50ms | ⭐⭐⭐⭐⭐ Excellent — conversation feels natural |
| 50-100ms | ⭐⭐⭐⭐ Good — slight delay, barely noticeable |
| 100-200ms | ⭐⭐⭐ Acceptable — noticeable delay, some overlap in conversation |
| 200-300ms | ⭐⭐ Poor — significant delay, people talk over each other |
| Over 300ms | ⭐ Unusable — conversation is extremely difficult |
How to reduce latency:
- Use a wired Ethernet connection instead of WiFi
- Choose a VoIP provider with servers close to your location
- Reduce network congestion (limit other traffic during calls)
- Upgrade to a lower-latency internet service (fiber > cable > DSL > satellite)
- Avoid satellite internet for VoIP if possible (inherently high latency: 500-700ms)
2. Jitter
| Jitter | Call Experience |
|---|---|
| Under 15ms | ⭐⭐⭐⭐⭐ Excellent — smooth, consistent audio |
| 15-30ms | ⭐⭐⭐⭐ Good — minimal effect with jitter buffer |
| 30-50ms | ⭐⭐⭐ Acceptable — occasional audio hiccups |
| Over 50ms | ⭐⭐ Poor — frequent choppy audio, missed words |
How to reduce jitter:
- Use wired Ethernet (WiFi inherently adds jitter)
- Enable QoS (Quality of Service) on your router
- Reduce network congestion
- Use a dedicated internet connection for VoIP if possible
- VoIP platforms use jitter buffers to smooth out variation
3. Packet Loss
| Packet Loss | Call Experience |
|---|---|
| Under 1% | ⭐⭐⭐⭐⭐ Excellent — imperceptible |
| 1-2% | ⭐⭐⭐⭐ Good — rare, minor audio glitches |
| 2-5% | ⭐⭐⭐ Acceptable — noticeable audio gaps |
| 5-10% | ⭐⭐ Poor — significant audio missing |
| Over 10% | ⭐ Unusable — conversation falls apart |
How to reduce packet loss:
- Use wired Ethernet connection
- Replace old or faulty network equipment (router, switches, cables)
- Reduce network congestion
- Check for interference on WiFi networks
- Contact your ISP if packet loss is consistently high
How to Test Your Internet for VoIP Readiness
Step 1: Basic Speed Test
Go to speedtest.net and run a test. Note: Download speed, Upload speed, and Ping (latency). Run the test 3 times at different times of day (morning, midday, evening) to get a realistic picture.
Step 2: VoIP-Specific Test
| Tool | What It Tests | URL |
|---|---|---|
| Speed Test by Ookla | Basic speed + ping | speedtest.net |
| 8x8 VoIP Test | VoIP-specific quality | 8x8.com/voip-test |
| MasterVoIP Test | MOS score prediction | mastervoip.com |
| Bandwidth Place | Speed + VoIP readiness | bandwidthplace.com |
Step 3: Real-World VoIP Test
The best test is making actual VoIP calls:
- Sign up for a free trial of CallOrbit
- Make test calls to different numbers
- Test during peak business hours
- Test with multiple users calling simultaneously
- Listen for clarity, delays, echoes, or choppy audio
Internet Types Ranked for VoIP
| Internet Type | VoIP Rating | Why |
|---|---|---|
| Fiber Optic | ⭐⭐⭐⭐⭐ | Fastest, lowest latency, symmetric speeds |
| Cable | ⭐⭐⭐⭐ | Fast download, decent upload, reliable |
| DSL | ⭐⭐⭐ | Adequate for small teams, slower speeds |
| Fixed Wireless | ⭐⭐⭐ | Depends on provider, can be good |
| 5G Home Internet | ⭐⭐⭐ to ⭐⭐⭐⭐ | Improving rapidly, latency varies |
| 4G/LTE Hotspot | ⭐⭐⭐ | Good backup option, variable quality |
| Satellite (Starlink) | ⭐⭐ to ⭐⭐⭐ | Improving, but latency can be an issue |
| Traditional Satellite | ⭐ | High latency (500ms+), not recommended |
Our recommendation: If VoIP is critical to your business, invest in fiber optic internet. The cost difference is usually $20-$50/month more, but the quality improvement is dramatic.
Optimizing Your Network for VoIP
1. Enable QoS (Quality of Service)
QoS tells your router to prioritize VoIP traffic over other internet activities.
How to set up QoS:
- Log into your router's admin panel (usually 192.168.1.1 or 192.168.0.1)
- Find the QoS or Traffic Management section
- Enable QoS
- Set VoIP/voice traffic as highest priority
2. Use a VLAN (For Larger Offices)
Separate your VoIP traffic onto its own virtual network to prevent other traffic from interfering and easier troubleshooting. Requires managed switches.
3. Upgrade Your Router
| Team Size | Router Type | Price Range |
|---|---|---|
| 1-5 users | Quality consumer router | $80-$150 |
| 5-15 users | Small business router | $150-$400 |
| 15-50 users | Enterprise router | $400-$1,500 |
| 50+ users | Enterprise with VoIP optimization | $1,000-$5,000+ |
4. Use Wired Connections
WiFi adds latency, jitter, and potential for interference. A $5 Ethernet cable provides dramatically better call quality than a $300 WiFi access point.
5. Separate Business and Personal Internet
A dedicated internet connection for business ensures that personal streaming or other devices don't affect your critical calls.
Bandwidth Calculator
VoIP Bandwidth = (Concurrent Calls × Bandwidth Per Call) + 20% overhead
Example for 10 concurrent HD calls:
= (10 × 0.1 Mbps) + 20%
= 1.0 Mbps + 0.2 Mbps
= 1.2 Mbps for VoIP only
Total Internet Needed:
= VoIP bandwidth + Other business usage + 30% buffer
= 1.2 Mbps + 25 Mbps + 7.8 Mbps
= 34 Mbps minimum
→ Recommended: 50 Mbps plan
Troubleshooting Common VoIP Quality Issues
| Problem | Likely Cause | Solution |
|---|---|---|
| Choppy audio | Jitter or packet loss | Wired connection, QoS, reduce congestion |
| Delayed audio (echo) | High latency | Check ping, switch to fiber, reduce hops |
| One-way audio | Firewall/NAT issue | Configure firewall for SIP/RTP ports |
| Dropped calls | Packet loss or saturation | Bandwidth upgrade, QoS, wired connection |
| Robot/garbled voice | Severe packet loss | Check connection, replace equipment |
Remote Worker VoIP Requirements
| Requirement | Minimum | Recommended |
|---|---|---|
| Download speed | 10 Mbps | 25+ Mbps |
| Upload speed | 3 Mbps | 10+ Mbps |
| Ping/latency | Under 100ms | Under 50ms |
| Connection type | WiFi 5GHz | Wired Ethernet |
Frequently Asked Questions
Q: Can I use VoIP with slow internet (under 10 Mbps)?
A: For a single user, VoIP works with as little as 1-3 Mbps total. However, quality may suffer during peak usage.
Q: Will VoIP slow down my other internet activities?
A: Without QoS, yes. With QoS, VoIP gets priority and the actual bandwidth impact is minimal (0.1 Mbps per call).
Q: Is 5G good enough for VoIP?
A: It can work well, but consistency varies. Best as a backup connection.
Q: My internet speed test shows 100 Mbps but VoIP quality is still poor. Why?
A: The issue is likely high jitter, packet loss, or poor QoS configuration rather than raw speed.
Related Articles:
- Does VoIP Work Internationally?
- Can My Team Work From Home With the Same VoIP System?
- Call Center Software Setup: How Easy Is It Really?
- Why Your Call Center Software Should Be Cloud-Based