AMR Codec For Windows Mobile - Applies to Windows Mobile 5/6 high-performance AMR encoder/decoder, Narrowband (8 kinds of rate)
Supporting the rate there is:
MR475
MR515
MR59
MR67
MR74
MR795
MR102
MR122
At Dopod 310 (CPU: 201) encoded on the test results: 1600 sample required only 25 milliseconds, CPU occupancy rate of 25%