How to send an SMS via Sipgate API and Ruby

sms.rb

require 'xmlrpc/client'

class SMS

  def self.deliver(phonenumber, text)
    user = Rack::Utils.escape(SIPGATE_USER_NAME)
    url = "https://#{user}:#{SIPGATE_PASSWORD}@api.sipgate.net/RPC2"
    client = XMLRPC::Client.new2(url)
    client.call('samurai.ClientIdentify', {'ClientName' => 'Ruby-Client'} )
    number = strip_phonenumber(phonenumber)
    args = {
      'RemoteUri' => "sip:#{number}@sipgate.net",
      'TOS' => 'text',
      'Content' => text[0,159]
    }
    if r = client.call('samurai.SessionInitiate', args)
      Rails::logger.info("*** SMS sent to #{number} (#{r.inspect})")
      Rails::logger.info("*** SMS text: #{text}") if Rails.env.development?
    else
      raise "sms send failed: #{r}"
    end
  end

  private

  def self.strip_phonenumber(number)
    number.gsub!(/\D/, '')
    number.gsub!(/^01/, '491')
    number.gsub!(/^00491/, '491')
    number
  end
end