Four Linux softphones reviewed
The review of four Linux softphones has a useful table of the various codecs and their bandwidth requirements.
| Kiax | Linphone | Twinkle | X-Lite | |
| Protocol Support | ||||
| SIP | No | Yes | Yes | Yes |
| IAX | Yes | No | No | No |
| Codec Support | ||||
| G.711u 64 Kbps | Yes | Yes | Yes | Yes |
| G711a 64 Kbps | No | Yes | Yes | Yes |
| GSM 13 Kbps | Yes | Yes | Yes | Yes |
| iLBC 13.3-15.5 Kbps | Yes | With patch | No | Yes |
| Speex 2.15-44.2 Kbps | Yes | Yes | No | Yes |
| DoD 1015 2.4 Kbps | No | Yes | No | No |