An ESI professional is a person who is paid to assist with electronically stored information, and specifically, electronic discovery. An ESI professional is often someone with experience in information technology (IT). Sometimes an ESI professional is an attorney with technical skills, but often an attorney will partner with a person skilled in computer data processing [...]

Electronic discovery and electronically stored information (ESI) involves a variety of terms and concepts. These terms and concepts can be unfamiliar and confusing to someone who is new to electronic discovery or ESI.
The electronic discovery terms and concepts listed below are defined and explained for those who are still learning about electronic discovery.

ESI Professional
Electronic Discovery [...]

Electronic Discovery of voicemail and digital audio files is increasingly important in cases. For more information, here are two research papers that may be useful to you:

Voicemail: The Next E-Discovery Challenge
Voice Mail and Audio Recordings: Evolving E-Discovery Standards