IMR (Interactive Media Response)
A technology that allows a computer to interact with humans where a person can see and/or hear computer-generated voice, video, or text and respond by speaking, typing, making gestures on video, or generating DTMF tones on a keypad.
An IMR system performs similar functions as an IVR (Interactive Voice Response) system but also handles video and text media.
Relevant NENA Documents
Detailed Functional and Interface Standards for the NENA i3 Solution