KPN Netherlands and China Mobile completed what is believed to be the industry's first international Internet Protocol Multimedia Subsystem (IMS) based Voice over LTE (VoLTE) roaming call. The interconnection between Europe and Asia was enabled using Huawei's solution.
This IMS-based call was initiated by KPN Netherlands and connected by China Mobile utilizing IBASIS as a tandem office. It was tested to verify the commercial deployment of international VoLTE roaming. During the call, high-fidelity voice and video capabilities were successfully tested and provided a strong foundation for long distance communication.
Mr. Long Jiping, Vice President, Huawei Core Network, spoke about the test. He said, "Huawei is committed to promoting commercial VoLTE deployment globally. We feel honored to cooperate with KPN and China Mobile to complete this call. As 4G evolves Huawei will continue to work with both operators to stimulate a smooth network evolution from 3G. This will bring higher quality service experience to their users."
http://pr.huawei.com/en/news/hw-375000-lte.htm#.VER6Sfm8G-0