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.