Voxeet, an audio conference service, announced today that it took in a $1.5 million round, led by LDV Partners.

The startup also announced the international launch of Voxeet 4.0, a service that builds on the startup’s “3D TrueVoice surround sound” technology to offer what the company is calling “the richest audio available with powerful collaboration features.”

“Conference calling is a massive market opportunity in Asia,” said LDV Partners’ Wayne Zhang. “Voxeet has built the best audio optimization technology and is in a position to do very well in countries like China, where bandwidth challenges are commonplace.”

Voxeet 4.0 will be available on iOS, Android, and the Web.

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To date, Voxeet has raised at least $3 million. Other Voxeet investors include Partech Ventures, French VC Aquiti, and WebEx co­founder Susan Xu.