Singapore's StarHub has staked a claim of being the first mobile operator in Southeast Asia to conduct a commercial GSM VoLTE call over its live LTE network.
The company conducted the call using VoLTE equipment from NSN that conforms to the GSMA VoLTE IR.92 specification.
StarHub revealed it plans to make the service available to customers next year, once a range of VoLTE-capable handsets are commercially available.
The successful test comes nine months after StarHub launched HD Voice over 3G, and two months after it announced that its LTE network now provides island-wide street-level coverage.
Last week, China Mobile and Huawei also announced they have conducted the first international VoLTE call between a TD-LTE and an FDD LTE network.
China Mobile, NTT DoCoMo and KT announced yesterday that they have extended their business tie-up to help accelerate the development of international LTE roaming services between China, Japan and South Korea.
The three operators formed a business collaboration in January 2011. So far, the collaboration has focused on Wi-Fi roaming, common specifications for NFC roaming and sharing mobile content for their respective market portals.