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
bits per second), and DSL (between 128 Kbps to 6 Mbps for sending data [“downstream”], and between 128 Kbps to 512 Kbps for receiving data [“upstream”]). Your choice of equipment will affect the speed at which you can transmit voice data, as well as the number of users your VoIP system can support. Network Structure Your network structure (AKA topology or layout ) determines the way in which all computers in a network are connected. Network structure types include point-to-point, bus, star, ring,