https://www.itnews.com.au/news/optus-set-to-be-first-with-voice-over-wi-fi-405817
Optus set to be first with voice over wi-fi - iTnews
Telstra 'looking closely'.
voice over wi fito beoptussetfirst
https://www.electronicdesign.com/technologies/communications/article/21765039/testing-braces-itself-for-voice-over-wi-fi
Testing Braces Itself For Voice Over Wi-Fi | Electronic Design
As long as wireless test can depict its roaming time and behavior, VoWi-Fi Seems Fated To Inherit Wi-Fi's Popularity.
voice over wi fitestingbraceselectronicdesign