ZTE Corporation demonstrated successful IMS (IP Multimedia Subsystem) based Voice over LTE (VoLTE) calls on CSL Limited (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. This is the first time VoLTE calls are made to the industry based on the inter-operability of LTE network and existing 2G/3G networks. 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). Through the use of its IMS-based solutions and LTE expertise, ZTE is able to demonstrate how voice will work seamlessly in the future.

ZTE provided Uni-CORE solutions for CSL to build an intelligent, convergent and high-performance core network, achieving 2G/3G/4G full convergence. CSL’s network will support accurate service control and content-based billing. It provides powerful data throughput to ensure that the network can deal with the challenges from the explosive growth of data traffic as well as an increasingly complex services.

"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.