You may need to contact your service provider. We offer an extensive number of audio formats, each with their own unique specifications.
Here is a breakdown of the specs:
1. Bit depth: (i.e., 8 bit, 16 bit)
2. Sample rate: (i.e., 8kHz, 11kHz)
3. Codec: (ie., Ulaw, PCM)
4. Extension: (i.e., .wav, .mp3)