Net2Phone Max Series Sales Manual page 36

F
Full-Duplex
In telephony and data communications, full-duplex refers to the ability for communicating parties to simultaneously send and
receive information without degrading the quality of the content.
FXO Interface
FXO stands for "Foreign Exchange Operator". With regards to the Max series, FXO enables you to connect the Max to a PBX
through an analog line card (SLIC/SLIB). With an FXO Max unit, inbound PSTN calls and remote calling are supported.
FXS Interface
FXS stands for "Foreign Exchange Station". With regard to the Max series, you can plug standard analog phones into a Max
FXS unit. The FXS version of the Max does not support inbound PSTN calling, but you can receive calls (via *72) from other
Max units. It is possible to attach FXS lines to a PBX through an analog trunk card (COIC/COIB).
G
Gateway
A gateway is an entrance and an exit for a communications network. For example, a gateway can bridge the PSTN (Public
Switched Telephone Network) with the Internet, or an Intranet. A gateway is the link which connects both communication
mediums and allows telephone-to-telephone calls via the Internet.
H
H.323
The H.323 specification, popular for IP Telephony, defines packet standards for voice and video conferencing over LANs and the
Internet. H.323 utilizes several audio codecs, including G.711 and G.723.1.
Half-Duplex
Unlike full-duplex communications, half-duplex does not allow for the simultaneous data transmission from two parties. An
example of half-duplex communications would be a walkie-talkie.
Hunt Group
A hunt group refers to a group of related phones that can be set up to share particular lines. For example, a hunt group can be
established when connecting a Max FXO unit to a PBX. When multiple FXO ports on the Max are connected to the PBX, the
phones on the PBX can be programmed to share these lines. Users would dial their hunt group code to have access to any of
the available lines. The PBX accomplishes this by handing off the calls to the next available FXO port on the Max. The user
would receive a busy signal if all of the lines of the hunt group were busy, or the PBX could be programmed to automatically
hand the call off to the traditional PSTN phone system. A hunt group can also be set up for a Max FXS unit connected to a PBX.
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