ontropo.rb

transcribe(mp3source, { :transcriptionOutURI => resulturi })

onyourserver.rb

require 'httparty'

class TropoTranscriber
  include HTTParty
  base_uri 'http://api.tropo.com/1.0/sessions' 

  def initialize(token)
    @token = token
  end

  def request_transcription(file_location, results_location)
    self.class.get("/action=create&token=#{@token}&mp3source=#{file_location}&resulturi=#{results_location}")
  end
end

tropo = TropoTranscriber.new

# Hey, transcribe something!

tropo.request_transcription 'http://host/file_path', 'http://host/post_transcription'