kunwei2005

Please read about Asterisk at http://www.asterisk.org/ . It is a full featured open source PBX running on Linux. I have installed it on a Fedora Core 4 Linux machine without any problem. 1. Asterisk Quick Start 1.1 Download and install Asterisk Download and install Asterisk is straightforward. Please follow the instructions at http://www.asterisk.org/index.php?menu=download . Once it is done, type asterisk –vc to test it works. # asterisk –vc Asterisk Ready. CLI> help CLI> stop now Beginning asterisk shutdown.... Executing last minute cleanups Asterisk cleanly ending (0) 1.2 Configure Asterisk with files Run make samples to get the sample configuration files under /etc/asterisk. Follow the Asterisk: A Bare-Bones VoIP Example at http://www.onlamp.com/lpt/a/3956 . Now you should have all configurations setup under /etc/asterisk as following: # cat sip.conf [general] port=5060 bindaddr=0.0.0.0 allow=all context=bogon-...

Chapter 1 Networking Technologies Topology • Point-to-point • Star – 10BaseT Ethernet • Bus – 10Base5, 10Base2 • Ring – FDDI(Fiber Distributed Data Interface) Physical Topology Logical Topology Ethernet Bus, Star, p2p Bus Token Ring Bus Ring FDDI Ring Ring Meshing - partially or fully Types • LAN o Ethernet, Fast Ethernet (FE), Gigabit Ethernet (GE), Token Ring, FDDI • WAN o circuit-switched temp or backup analog dialup ISDN o cell-switched cell - fixed length packets expensive, QoS ATM, Switched Multi-megabit Data Services(SMDS) o packet-switched variable length packets cost-effective, less QoS Frame Relay, X.25 o dedicated connections o cable and DSL modem – always connected, cable share logical bus topology o channel servic...