ZTE has demonstrated successful IMS based Voice over LTE (VoLTE) calls on CSL's LTE network and its existing mobile networks at Mobile Asia Congress 2010 (MAC 2010). The calls finished between IMS clients as well as IMS client and conventional 2G/3G handsets. In addition, supplementary services such as call forwarding, call waiting were demonstrated. VoLTE is the next step in developing a standard way of delivering voice for Long-Term Evolution (LTE).

In July this year, ZTE and CSL began deployment of the 1800 MHz/2600 MHz dual-band LTE network as well as the upgrade of CSL's existing 3G network with Dual Cell technology. The dual-band LTE network takes advantage of CSL's spectrum position to provide customers with better coverage and enhanced penetration, for a more satisfying communications experience.

"The ability to achieve VoLTE is one of the biggest challenges for operators on the road to deploying LTE networks. ZTE collaborated with CSL to research this issue and obtained some valuable experience in voice applications over the LTE network. This not only lays the foundation for CSL's future IMS-based LTE advanced network deployment but also provides a significant reference for other operators, "said Xu Ziyang, President of ZTE's Core Network Products.