Page F-3
Appendix F – Network Topology
INTER-TEL
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AXXESS
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MANUAL VERSION 11.0 – May 2008
Terminology
APPENDICES
• NAT IP Address: This is the public IP address that is statically mapped to a specific
IPRC.
• Native IP Address: This is the native IP address that is statically mapped to a specific
IPRC.
• OAI: (Open Application Interface): System OAI is a system-level communications pro-
tocol that allows command-oriented tools to be developed for the phone system. System
OAI is available in two levels: Events and Third Party Call Control. System OAI
Events provides call status information to an external device. Its primary use is for auto-
matic call distribution products such as the Contact Center Suite. System OAI Third
Party Call Control is a TSAPI protocol that allows system command-oriented tools to
be used on the phone system. Contact Inter-Tel for more information regarding products
and development materials for these features.
• 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).
• 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 sepa-
rated from the public network (the Internet) by a firewall.
• Public: In networking terminology, public refers to the Internet. This network is consid-
ered untrusted because there are few controls about what it contains. The private net-
work 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 for-
warding according to rules that describe the subnet topology. Routers usually make
routing decisions based on IP address. Modern routers often contain some firewall func-
tionality.
• SIP (Session Initiation Protocol): This protocol is an IETF standard for Internet tele-
phony, conferencing, etc. It is a peer-to-peer text-based protocol focused on signaling
setup and teardown. SIP is not a media protocol.
• SIP Server: SIP server is an Inter-Tel product that provides connectivity to SIP end-
points.
• SPI (Stateful Packet Inspection): SPI is provided by firewalls that allow IP communica-
tion to take place if it is initiated from the trusted network – the firewall keeps track of
which sessions (conversations) are active (state).
• Subnet: A subnet is a grouping of devices that share common routing information.
• 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.
• VPN (Virtual Private Network): A VPN is a network that uses a public medium, typi-
cally the Internet, to provide connectivity to a logically private network. VPNs use
encrypted tunnels to carry the private traffic in a secure manner.
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