VoIP Bandwidth Calculator
Calculate bandwidth requirements for Voice over IP deployments.
Codec Comparison
| Codec | Bitrate | MOS | BW/Call* |
|---|---|---|---|
| G.711 | 64 kbps | 4.1 | 87.2 kbps |
| G.722 | 64 kbps | 4.5 | 87.2 kbps |
| G.729 | 8 kbps | 3.9 | 31.2 kbps |
| Opus WB | 20 kbps | 4.3 | 43.2 kbps |
| G.723.1 | 6.3 kbps | 3.6 | 21.9 kbps |
*With 20ms packets, Ethernet, IPv4, no SRTP
VoIP Bandwidth Formula
Bandwidth Calculation
BW = (Payload + Headers) * 8 * PPS
PPS = 1000 / packet_size_ms
Headers = L2 + IP + UDP(8) + RTP(12) [+ SRTP(10)]
PPS = 1000 / packet_size_ms
Headers = L2 + IP + UDP(8) + RTP(12) [+ SRTP(10)]
VoIP bandwidth includes significant overhead from protocol headers, especially for low-bitrate codecs where headers can exceed payload.
Quality Considerations
- Latency: <150ms one-way for good quality
- Jitter: <30ms recommended
- Packet Loss: <1% for acceptable quality
- MOS Score: 4.0+ is toll quality