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Chapter 3
Appendix
Glossary
Proxy Server
Protocol
Router
Registration Server
This is the computer that connects to the internet as an "agent" in place of internal computers that
cannot directly connect to the internet, and is the boundary between the internet and the internal
network of an enterprise.
This is the communications procedure that must mutually be in accord when multiple computers are
communicating. If the protocol differs, communications are not possible.
This is the device for relaying data that flows in the network to other networks.
It has the function of analyzing the protocol, looking at the address and selecting the route. In
addition, all data of unsupported protocols is discarded.
This is the server for registering and managing the SIP user information.
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