While I have seen this done with HMP on both Linux and windows, it might be better to move to using PowerMedia XMS in this case.
Here is an exert from the 3.5 release notes here:
www.dialogic.com/.../XMS_ReleaseNotes.pdf
"PowerMedia XMS offers multiple media control protocols that can be used in a variety of network infrastructures. For example, a SIP application server (AS) can drive PowerMedia XMS using the MSML control interface or use the VoiceXML (VXML) browser in PowerMedia XMS to execute VXML scripts and invoke MRCP speech services, like ASR and TTS."
Jeff