CCIE, which stands for Cisco Certified Internetwork Expert is the highest level of professional certification offered by Cisco and is currently considered the toughest of all and the fact that there are only less than thirty thousand CCIE professionals worldwide is no less than a proof in itself. The CCIE and CCIE voice certification was started by Cisco in the year 1993 and was a two day lab programme which has now been reduced to just one day (read eight hours).
Instead of spending thousands of dollars on training in different institutions for more than twelve to eighteen months, many successful candidates create their own CCIE voice lab with help of old or discarded Cisco network components and train themselves. For any candidate looking for a cheaper solution than spending several thousands of dollars on training can look out for help from a professional who has created a lab of his own in the past.
An updated version of a CCIE voice workbook available on the internet could also be of great help to aspiring candidates. A lab preparation workbook is a technical product which is developed by certified engineers. Every few months, there are several releases that appear on the internet and a little research could get you to one of your understanding.