===== Seguridad en Voip =====
  * http://blog.txipinet.com/2006/10/11/38-seguridad-en-voip-i-cracking-de-contrasenas-sip-en-gnu-linux/
  * http://busy-tone.org/


==== Analizadores ====
  * https://www.sipcapture.org/
  *https://github.com/irontec/sngrep/