Dutch language news article:
http://www.security.nl/artikel/41666/1/Onderzoeker_kraakt_telefonisch_banksysteem.html
Presentation slides:
http://conference.hitb.org/hitbsecconf2012ams/materials/D2T2%20-%20Rahul%20Sasi%20-%20CXML%20VXML%20Auditing%20for%20IVR%20Pentesters.zip