22. The computer program product of claim 21 , wherein executing the voice markup language script comprises: interpreting the voice markup language script to produce an audio output.
22. The computer program product of claim 21 , wherein executing the voice markup language script comprises: interpreting the voice markup language script to produce an audio output. 26. The computer program product of claim 22 , wherein executing the voice markup language script comprises: identifying text requiring conversion to speech; and placing a text-to-speech request in the output queue.