IMR (Interactive Media Response) is an automated service used to play announcements, record responses, and interact with callers using any or all of audio, video, and text.
IVR (Interactive Voice Response)
A technology that allows a computer to interact with humans where a person can hear a computer-generated voice and respond by speaking or generating DTMF tones on a keypad. As an example, a "Ported Number IVR" is a computer system accessible by registered users utilized to identify the Service Provider and 24 X 7 access number for telephone numbers which have been ported or pooled.
Relevant NENA Documents