VoIP Call Quality
That Beats Landlines
Modern VoIP sounds better than traditional phone service — if the provider does it right. Here's what actually controls VoIP call quality, what to expect, and how Zonitel delivers HD audio on every call, across any business internet connection.
4.2+
average MOS score
< 100ms
typical latency
99.99%
uptime SLA
HD
Opus wideband codec
What Actually Affects VoIP Call Quality
Four variables determine whether a VoIP call sounds great or terrible.
Internet quality
Latency under 150ms, jitter under 30ms, and packet loss under 1% deliver toll-quality calls. Most modern broadband easily meets this.
Network equipment
QoS on your router prioritizes voice packets. A properly configured business router makes a huge difference.
Codec selection
Zonitel uses Opus — adaptive, wideband, and the same codec Zoom and WhatsApp rely on. HD audio by default.
Provider infrastructure
Geo-redundant data centers, automatic failover, and smart SIP routing. Calls take the shortest path to the other party.
What Good Call Quality Looks Like
Target thresholds for toll-quality VoIP calls.
| Metric | Excellent | Acceptable | Problem |
|---|---|---|---|
| Latency (one-way) | < 100 ms | 100–150 ms | > 150 ms |
| Jitter | < 20 ms | 20–30 ms | > 30 ms |
| Packet loss | < 0.5% | 0.5–1% | > 1% |
| MOS score | 4.3+ | 4.0–4.3 | < 4.0 |
| Bandwidth (per call) | 100+ Kbps | 50–100 Kbps | < 50 Kbps |
How Zonitel Delivers HD Call Quality
Six things we do so you don't have to think about call quality.
Opus HD codec default
Same codec as Zoom, WhatsApp, and Discord. Wideband audio (50 Hz–7 kHz) with adaptive bitrate.
Geo-redundant data centers
Multiple US and Canadian regions. If one region has issues, traffic routes automatically.
Real-time MOS monitoring
Mean Opinion Score (MOS) is calculated per call and surfaced in the dashboard. Anything under 4.0 triggers review.
Automatic internet failover
If office internet drops, the mobile app switches to cellular. Calls stay connected.
QoS configuration support
Free help configuring your router to prioritize voice traffic during onboarding.
Pre-deployment network test
Run a bandwidth and latency test on your network before switching. We tell you if anything needs fixing first.
See Every Call's Quality in Real Time
The Zonitel Analytics dashboard surfaces MOS score, latency, jitter, and packet loss for every call. Sort by user, extension, or location to find and fix quality issues before they become complaints.
- MOS score per call
- Latency and jitter trends
- Packet loss alerts
- Per-extension quality reports
Live Call Quality
Sales — Carlos
MOS score · last 24h
Support — Jennifer
MOS score · last 24h
Reception
MOS score · last 24h
Remote — Marcus
MOS score · last 24h
Frequently Asked Questions
Is VoIP call quality worse than a landline?
No — in most cases, modern VoIP is better. Landlines are limited to narrowband audio (300 Hz–3.4 kHz), while VoIP using HD codecs like Opus or G.722 delivers wideband audio (50 Hz–7 kHz) and even super-wideband. What used to be a disadvantage for VoIP — internet quality — has mostly disappeared thanks to faster broadband, better codecs, and smarter routing.
What affects VoIP call quality?
Three things matter most: (1) your internet connection — bandwidth, latency, jitter, and packet loss; (2) your network equipment — router, switch, and QoS configuration; (3) the VoIP provider's infrastructure — codecs, geo-routing, and failover. Zonitel handles #3; we also help customers diagnose #1 and #2 during onboarding.
How much bandwidth does a VoIP call need?
A single HD voice call uses about 100 Kbps (0.1 Mbps) in each direction. A standard-definition call uses about 30 Kbps. For a team of 10 making concurrent calls, you need roughly 1 Mbps of reliable upload/download. Any modern business internet connection has more than enough bandwidth — the more important metrics are latency and jitter.
What is acceptable latency and jitter for VoIP?
Latency under 150 ms (one-way) and jitter under 30 ms deliver toll-quality calls. Packet loss should be under 1%. Zonitel's dashboard shows these metrics in real-time per call so you can troubleshoot any issues immediately.
Do I need a special router for VoIP?
No, but Quality of Service (QoS) configuration helps. Modern business routers can prioritize VoIP traffic so voice packets get sent ahead of web traffic, downloads, or video. Zonitel provides recommended QoS settings and can help you configure your router at no charge.
What codec does Zonitel use?
Zonitel uses Opus as the default codec — the same codec used by Zoom, WhatsApp, and Discord. It's wideband HD, adaptive to network conditions, and consistently rated the highest-quality voice codec in use today. For legacy endpoints, we also support G.722 and G.711.
What happens if my internet drops during a call?
Zonitel supports automatic failover to mobile networks. If your office internet drops, the mobile app switches to cellular data and the call keeps going. Incoming calls automatically route to mobile apps or forward to cell numbers. No dropped calls, no manual switching.
Can I monitor call quality across my team?
Yes. The Zonitel Analytics dashboard shows MOS (Mean Opinion Score), latency, jitter, and packet loss for every call — per user, per line, or aggregated. If a specific extension has consistent issues, you can drill down to root cause it.
Hear the Difference HD VoIP Makes
Opus HD codec, real-time MOS monitoring, and automatic failover — on every call. Start a 30-day free trial and test it on your own network.