Voice Quality
VoIP codec comparison
Codec choice is a compatibility and network-design decision, not only a bit-rate decision.
| Codec | Typical fit | Main consideration |
|---|---|---|
| G.711 | PSTN interoperability | High bandwidth, low complexity |
| G.722 | Wideband business voice | Requires end-to-end support |
| Opus | Web, mobile, conferencing | Flexible and modern, but support varies |
| G.729 | Legacy constrained links | Legacy licensing and interoperability concerns |
| iLBC | Older loss-tolerant systems | Limited modern support |
| AMR-WB | Cellular contexts | Carrier and endpoint dependent |
Start with the full voice codec guide and test the actual carrier, SBC, PBX, and handset combination.