This invention is based on being able to locate a voice server, temporarily allocate it, send it the audio of you saying “When is flight 683 due to arrive?”, getting the results of what you said back in the browser, and deallocating the voice server for use by the next person talking into their browser. Voice channels and IVR ports are initially set up by a switch and the IVR using conventional audio protocols. The Voice channels are not initially connected to the client. The switch handles the allocation and deallocation of IVR voice channels without having to communication further with the IVR. A user indicates (usually by pressing a PTT button) to the client device that he wishes to initiate a voice interaction during an X+V session. This translates to a request on the CTRL channel to synchronise the XHTML and VXML forms which the embodiment uses as a trigger for the VXML browser to execute a conversational turn. The multiplexer intercepts this control command and connects the virtual voice circuit between the device and an existing open but unattached voice port. The virtual circuit is connected without having to set up an RTP channel. The CTRL signal is then forwarded to the interaction manager so that the conversation can take place. At the end of the conversation the virtual circuit is disconnected.