Telstra has enabled Voice-over-LTE (VoLTE) on its commercial network.
The carrier says the roll out will be staggered, gradually enabling the full HD capability for different types of calls (ie 4G to 4G, 4G to fixed,4G to 3G etc). The new voice capability will first be enabled for post-paid consumer customers with supported handset. Telstra will then extend VoLTE to business customers and finally to prepaid customers.
Telstra describes the VoLTE rollout as one of the largest and most complex changes to voice calling in its network for more than 40 years.
http://exchange.telstra.com.au/2015/09/16/next-generation-voice-calling-starts-today-telstra-volte/
- Telstra first enabled HD voice capabilities in 2011. Currently, Telstra estimates 70 percent of mobile handsets in Australia support HD and over 30 percent of all mobile calls use HD Voice today.