ZTE Corporation is to help China Mobile deploy voice over LTE (VoLTE) services on the operator's commercial TD-LTE network in Guangzhou, China, an important step towards a wider nationwide rollout. The VoLTE services on China Mobile's 4G TD-LTE network, constructed by ZTE, support enhanced single radio voice call continuity (eSRVCC) switching for seamless handovers to non-4G networks. The eSRVCC technology complies with the LTE-A 3GPP R10 standard, and greatly reduces latency times when switching voice services between a 4G network and 3G or 2G networks, ensuring that users do not perceive any change when moving between different networks.

The VoLTE deployment in Guangzhou was also enabled by a newly-built IP multimedia subsystem (IMS) system provided by ZTE. 4G smartphones with Qualcomm® Snapdragon(TM) 800 processors were recently used to demonstrate the system.