The table below shows codecs features:
| Codec | Frame Length | Input | Output |
|---|---|---|---|
| AMR GSM 06.90 | 20 ms | 8 KHz, 16 bit, Mono | Bitrates: 4750, 5150, 5900, 6700, 7400, 7950, 10200, 12200; a discontinuous transmission mode (DTX) available with 1750 bps non-speech frames |
| G.726 | 8 ms | 8 KHz, 16 bit, Mono (a-law, μ-law native support possible) | Bitrates: 16000, 24000, 32000, 40000 |