Man, I've been here for over 3 years now and I've finally managed to ruffle enough feathers to get a 1-star rating from 2 people?
I'll summarize the problem with VOIP, and whether you like this or not, it's the truth:
The problem is not the technology, it is the implementation, and part of the implementation depends on the skills of the installer.
One poor implementation of VOIP I've seen has an expensive Cisco IP phone mounted on a wall, configured as a ringdown to the security office.
There should be an analog phone connected to an ATA there. Not a phone which is #1, expensive to replace and #2, subject to abuse.
