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Title: A great introduction to Voice over IP networks
Review: A good read for those who wants to understand the basics of VoIP. Initially I picked up Daniel Collins' Carrier Grade Voice Over IP and that went way over my head. So I had to retrace my steps and go to something simpler; this one suited my needs. The emphasis is on Cisco gear (CCM, unity and such), but the general principals are all clearly explained. The first two chapters really gets your basics covered and also gives you an elemantary understanding of how PSTNs work; you are then introduced to packets over IP networks. SIP and H.323 is covered with fair amount of detail. The section on prioritizing traffic (QoS) is very helpful. All in all, this is a good introduction for those who are absolutely new to the topic.
