This whitepaper discusses acquiring VoIP parameters to take advantage of it and will demonstrate how to extract the password parameter from the provisioning mechanism used by Adamo Telecom Iberia S.A.U.
You can download it from the following link: https://packetstormsecurity.com/files/download/154520/call-your-key-to-phone-all.pdf
Source: https://packetstormsecurity.com/files/154520/Call-Your-Key-To-Phone-All.html