VOIP 培训教材

VoIP_training_notes(Rev_1)Voice Network & Data Network
Voice Network PSTN PSML Data Network IP ATM Frame Relay

PSTN versus IP
PSTN network
Analog (Digital can be defined) Circuit switching Design for Voice transmission Extended use for Data transmission

IP network
Digital Packet switching Design for Data transmission Extended use for Voice transmission (VoIP)

What is VoIP?
VoIP Voice over IP (Voice over IP network) Try to transmit voice signal using IP network

What is IP?
IP Internet Protocol One Protocol in TCP/IP Protocol Stack TCP/IP Protocol Stack One framework for data transmission 5 layers in the Stack

TCP/IP Protocol Stack
5 layers Each layer has many protocol choices
Application Transport Network Data link Physical FTP, HTTP, SIP TCP, UDP IP Ethernet, Sonet WDCT, DECT

TCP/IP Protocol Stack
Each lay