The IP Multimedia Subsystem (IMS) Profile for Voice and Video, documented in this Permanent Reference Document (PRD), identifies a minimum mandatory set of features which are defined in 3GPP specifications that a wireless device (the User Equipment (UE)) and network are required to implement in order to guarantee interoperable, high quality IMS-based telephony and conversational video services over Wi-Fi access networks.
Download IMS Profile for Voice, Video and SMS over Wi-Fi – Version 3.0 – 01 March 2016
Source: http://www.gsma.com/newsroom/all-documents/ir-51-ims-over-wi-fi-v/
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