|书名||Packet Guide to Voip over IP|
|简介||Go under the hood of an operating Voice over IP network, and build your knowledge of protocol ….|
Pulling the trigger early might put you at risk of making the wrong decision in terms of vendor or protocol. Adopting late might put you behind the competition or make you rush to deploy a system that is not well understood by the local staff.
VoIP protocols are broken into two categories: signaling and transport.
VoIP的信令可以分为两类，传输信令 与 传输媒体
It was a golden dream for some (consumers) and a nightmare for others; namely, the providers.
Some of these services offered calling plans for less than half the price of traditional carriers. Some of them, most notably Skype, had as one of their goals putting telephone companies out of business
In fact,UDP is sometimes considered a fire-and-forget protocol because once the packet leaves the sender, we think nothing more about it.