... recording and playback can simultaneously and independent.Can dynamically select a different voice encoding speed, and real-time speech compression ... 3400Hz ~On 256K 32K buffer: an uploaded file. -Digital voice: A/u my PCM, ADPCM. -Data rate: 64Kbps, 32Kbps, 16KbpsDTMF code: ... 0-9, *, #, A, B, C, DCaller: 2634 FSK, DTMFFSK modulation mode: ...