This article describes the specifications for recording wav files for IPCM. Additionally, makes recommendations on audio software to use to create these files.
Pre-recorded .wav files can be utilized within IPCM. You may create these files in any sound recording software such as Windows sound recorder, GoldWave, or Audacity to name a few. These files must be created in a specific format. For a .wav to play on a telephone system, it has to be 8khz, 16bit, mono.