A unified web-based voice messaging system provides voice application control between a web browser and an application server via an hypertext transport protocol (HTTP) connection on an Internet Protocol (IP) network. The web browser receives an HTML page from the application server having an XML element that defines data for an audio operation to be performed by an executable audio resource. The web browser selectively executes the audio operation based on whether the web browser detects the presence of the executable audio resource. If the web browser does not have the executable audio resource, then the web browser ignores the XML element, and merely presents any other recognized HTML tags. However if the web browser has access to an executable audio resource that understands the XML element, then the web browser executes the audio operation based on enhanced audio control specified by the XML element. Hence, a web browser can be used to provide enhanced voice control for voice enabled web applications, merely by possession of an executable audio resource that recognizes the XML element that specifies the enhanced audio control required for the audio operation to be performed.