The successful demonstration of standards-based inter-operability between LTE network and existing 2G/3G networks

17 November 2010, Hong Kong – ZTE Corporation (“ZTE”) (H share stock code: 0763.HK / A share stock code: 000063.SZ), a leading global provider of telecommunications equipment and network solutions, today demonstrates 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.The successful VoLTE showcase at MAC 2010 builds on the deep relations between ZTE Corp and CSL. In July this year, ZTE and CSL began deployment of the world's first 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. CSL is one of the first operators in the world to introduce LTE technology into its network infrastructure.

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.

CSL's LTE/DC-HSPA+network will provide users with a broader range of enhanced multimedia services. The IMS-based broadband voice solution demonstrated at this event and the further deployment of Single Radio Voice Call Continuity (SRVCC) solution in the future will promote CSL's mobile voice evolution from traditional network to LTE network.ZTE provides the continuously innovative core network solutions, helping CSL to keep its leading position in Hong Kong and enhanced customer 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.

ZTE is the provider of core network equipment and solutions supporting all access technologies. ZTE's all-IP Uni-CORE solutions covering fixed network softswitch, mobile softswitch and IMS. Recently, ZTE launched its IMS-based zMILE (ZTE's Multimedia Integrated Life Experience) solution, including IMS core network, RCS-compliant APP, and the 7 inch touch-screen ZTE Light multimedia tablet terminal with inbuilt an IMS client. The zMILE solution is a carrier-class multimedia solution, enabling a breakthrough in delivering a true multimedia experience to legacy end users over fixed and/or mobile networks, including LTE network. As of Q3 2010, ZTE core network globally served 1.34 billion subscribers around 110 countries.