gistfile1.rb

require 'rubygems'
require 'open-uri'
require 'curb'

api_access_key = "xxx"
url = "http://voicemail.alpha.orange-api.net/voicemail/updateAnnouncement.xml"

c = Curl::Easy.new url
c.multipart_form_post = true
c.http_post Curl::PostField.file('sound', './tt-monkeys.wav'), Curl::PostField.content('id', "#{api_access_key}")
p c.body_str