Which file format is primarily used for voicemail messages in IPO?

The WAV file format is primarily used for voicemail messages in the IPO platform due to its ability to provide high audio quality and its compatibility with various audio systems. WAV files are raw audio formats that are uncompressed, which allows for easy playback and manipulation of the audio data. This format is widely supported and often used in telephony applications, ensuring that voice messages are clear and of high fidelity when played back.

While other formats such as MP3 or AIFF may be utilized in some audio applications, they either involve compression that can degrade audio quality or are not as commonly used in telephony settings. Therefore, using WAV for voicemail messages aligns well with the requirements for clarity and compatibility in the IPO platform.