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FQDN Fully Qualified Domain Name. A FQDN consists of a host and domain name, including top-level
domain. For example,
www.grandstream.com is a fully qualified domain name. www is the host,
Grandstream is the second-level domain, and and.com is the top level domain.
FXO Foreign eXchange Office. An FXO device can be an analog phone, answering machine, fax, or
anything that handles a call from the telephone company like AT&T. They should also operate the same
way when connected to an FXS interface.
• An FXO interface will accept calls from FXS or PSTN interfaces. All countries and regions have
their own standards.
• FXO is complimentary to FXS (and the PSTN).
tation. An FXS device has hardware to generate the ring signal to the FXO
xtension (usually an analog phone).
TS+PSTN for the phone.
• The FXS Interface connects to FXO devices (by an FXO interface, of course).
n Protocol (DHCP) is an Internet protocol for automating the
FXS Foreign eXchange S
e
• An FXS device will allow any FXO device to operate as if it were connected to the phone
company. This makes your PBX the PO
DHCP The Dynamic Host Configuratio
configuration of computers that use TCP/IP. DHCP can be used to automatically assign IP addresses, to
deliver TCP/IP stack configuration parameters such as the subnet mask and default router, and to provide
other configuration information such as the addresses for printer, time and news servers.
ECHO CANCELLATION Echo Cancellation is used in
telephony to describe the process of removing
echo from a voice communication in order to improve voice quality on a telephone call. In addition to
improving quality, this process improves
bandwidth savings achieved through silence suppression by
preventing echo from traveling across a
network. There are two types of echo of relevance in telephony:
acoustic echo and hybrid echo.
Speech compression techniques and digital processing delay often
contribute to echo generation in
telephone networks.
H.323 A suite of standards for multimedia conferences on traditional packet-switched networks.
yper Text Transfer Pr
HTTP H otocol; the World Wide Web protocol that performs the request and retrieve
function
IP-P
IP T ep general term for
e technologies that use the Internet Protocol's packet-switched connections to exchange voice, fax, and
packet-switched
etworks; the process is reversed at the receiving end. The terms IP Telephony and Internet Telephony
R IVR is a software application that accepts a combination of voice telephone input and touch-tone
ail and
erhaps other media.
s of a server
IP Internet Protocol. A packet-based protocol for delivering data across networks.
BX IP-based Private Branch Exchange
el hony (Internet Protocol telephony, also known as Voice over IP Telephony) A
th
other forms of information that have traditionally been carried over the dedicated circuit-switched
connections of the public switched telephone network (PSTN). The basic steps involved in originating an
IP Telephony call are conversion of the analog voice signal to digital format and compression/translation
of the signal into Internet protocol (IP) packets for transmission over the Internet or other
n
are often used to mean the same; however, they are not 100 per cent interchangeable, since Internet is
only a subcase of packet-switched networks. For users who have free or fixed-price Internet access, IP
Telephony software essentially provides free telephone calls anywhere in the world. However, the
challenge of IP Telephony is maintaining the quality of service expected by subscribers. Session border
controllers resolve this issue by providing quality assurance comparable to legacy telephone systems.
IV
keypad selection and provides appropriate responses in the form of voice, fax, callback, e-m
p
Grandstream Networks, Inc. GXW-410x User Manual Page 35 of 37
Firmware 1.0.0.53 Updated: 04/2007