Hong Kong mobile operator CSL announced yesterday that it has deployed voice over LTE (VoLTE) on its 4G network, with commercial service expected in the first half of 2014. The company said that VoLTE calls will connect in one to two seconds compared with the five to ten seconds on circuit-switched networks, while customers can also use 4G mobile data services simultaneously while conducting VoLTE calls. As reported by Telecomasia, CSL’s new technology is enabled via the deployment of the eSRVCC (enhanced Single Radio Voice Call Continuity) solution in an IMS platform provided by its main 4G vendor, ZTE. CSL added that VoLTE is also more efficient from both a network and spectrum perspective, allowing CSL to use less bandwidth and put more customers on its LTE network. As VoLTE requires the installation of new software inside carrier networks and inside the phones themselves, commercial service will not be available until the first half of 2014, when the LTE handsets supporting the technology hit the market. CSL is currently testing a Samsung VoLTE handset. As reported by CommsUpdate last month, rival Hong Kong cellco PCCW reckons it will trump CSL by launching VoLTE by the year-end.