Mitel Inter-Tel 5000, Installation And Maintenance Manual

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Appendix B: Network IP Topology
Terminology
Inter-Tel
®
5000 Installation Manual – Issue 2.4, May 2008
Page B-3
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Port : In Internet Protocol terminology, a port is a logical subaddress of an IP address. The
port usually indicates the application layer protocol being used (for example, TCP port 80
indicates http).
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Private : In networking terminology, private refers to the portion of a network within an
organization. This private network is considered trusted. The private network is separated
from the public network (the Internet) by a firewall.
•
Public : In networking terminology, public refers to the Internet. This network is considered
untrusted because there are few controls about what it contains. The private network is
separated from the public network (the Internet) by a firewall.
•
Router : A router is a layer-3 device (OSI Model) that provides intelligent packet forwarding
according to rules that describe the subnet topology. Routers usually make routing
decisions based on IP address. Modern routers often contain some firewall functionality.
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SIP (Session Initiation Protocol): This protocol is an IETF standard for Internet telephony,
conferencing, etc. It is a peer-to-peer text-based protocol focused on signaling setup and
teardown. SIP is not a media protocol.
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SIP Server : SIP server is an Inter-Tel product that provides connectivity to SIP endpoints.
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SPI (Stateful Packet Inspection): SPI is provided by firewalls that allow IP communication
to take place if it is initiated from the trusted network – the firewall keeps track of which
sessions (conversations) are active (state).
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Subnet : A subnet is a grouping of devices that share common routing information.
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TFTP (Trivial File Transfer Protocol): TFTP is a simplified Internet standard for file
transfers used primarily for loading configuration and software updates to IP devices.
Unlike the more common FTP, TFTP provides no security mechanisms.
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VPN (Virtual Private Network): A VPN is a network that uses a public medium, typically the
Internet, to provide connectivity to a logically private network. VPNs use encrypted tunnels
to carry the private traffic in a secure manner.