A MIME type is a piece of metadata that indicates the type of content contained in a file. For example, an MP3 audio file is usually identified as audio/mpeg. When you enable call transcription, Zia analyzes a recent call recording from your account to check if the recording has a supported MIME type (the media type that specifies a file's format) and whether it can be transcribed.
Therefore, to help Zia validate transcription support, make sure your account has at least one recent call recording in WAV, FLV, FLAC, WebM, MP3, WMV, Opus, SWF, M4A, MP4, MPEG, MPG, MOV, AVI, or MKV format.
Pricing
As of today, there are no charges for call transcription regardless of the amount of audio processed.