In IP Telephony 101, I looked at the pros and cons of IP telephony, and a few of the considerations you should explore before making the switch to VoIP.
We’ll turn now to the nitty-gritty of VoIP systems: the architecture, the equipment, the network structure, the software, and what you can expect to pay.
But before we start, let’s get WAN and LAN out of the way. A LAN (local area
lan and wan