At Mobile Asia Congress 2010, ZTE demonstrated IMS-based Voice over LTE (VoLTE) calls running CSL’s LTE network in Hong Kong and its existing mobile networks. The calls finished between IMS clients as well as IMS client and conventional 2G/3G handsets.
The companies said their achievement marks the first time VoLTE calls have been made between an LTE network and an existing 2G/3G network. In addition, supplementary services such as call forwarding, call waiting were demonstrated.
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.
In July 2010, 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’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.
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