1. A method of producing spoken voice prompts for telephony-based informational interaction, the method comprising: for one or more voice prompts, determining words that receive an optimized speech parameter, based on context and/or meaning of the text of the one or more voice prompts in a context of a dialog with a listener; recording the one or more voice prompts, and thereby producing one or more spoken voice prompts; conveying the one or more spoken voice prompts to a listener over a telephone system; and conducting a telephony-based informational call with the target person.