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FQDN Fully Qualified Domai
domain. For example, www.g
n Name. A FQDN consists of a host and domain name, including top-level
randstream.com is a fully qualified domain name. www is the host,
or
rom the telephone company like AT&T. They should also operate the same
es (by an FXO interface, of course).
ion of computers that use TCP/IP. DHCP can be used to automatically assign IP addresses, to
rovide
ving
to
sion by
one networks.
retrieve
/translation
same; however, they are not 100 per cent interchangeable, since Internet is
IP
of service expected by subscribers. Session border
s.
combination of voice telephone input and touch-tone
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,
nything that handles a call f
a
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).
FXS Foreign eXchange Station. An FXS device has hardware to generate the ring signal to the FXO
extension (usually an analog phone).
An FXS device will allow any FXO device to operate as if it were connected to the phone company. This
makes your PBX the POTS+PSTN for the phone.
he FXS Interface connects to FXO devic
T
DHCP The Dynamic Host Configuration Protocol (DHCP) is an Internet protocol for automating the
onfigurat
c
deliver TCP/IP stack configuration parameters such as the subnet mask and default router, and to p
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 remo
echo from a voice communication in order to improve voice quality on a telephone call. In addition
mproving quality, this process improves
i bandwidth savings achieved through silence suppres
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
ontribute to echo generation in teleph
c
H.323 A suite of standards for multimedia conferences on traditional packet-switched networks.
HTTP Hyper Text Transfer Protocol; the World Wide Web protocol that performs the request and
functions of a server
IP Internet Protocol. A packet-based protocol for delivering data across networks.
IP-PBX IP-based Private Branch Exchange
IP Telephony (Internet Protocol telephony, also known as Voice over IP Telephony) A general term for
the technologies that use the Internet Protocol's packet-switched connections to exchange voice, fax, and
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
P Telephony call are conversion of the analog voice signal to digital format and compression
I
of the signal into Internet protocol (IP) packets for transmission over the Internet or other packet-switched
networks; the process is reversed at the receiving end. The terms IP Telephony and Internet Telephony
re often used to mean the
a
only a subcase of packet-switched networks. For users who have free or fixed-price Internet access,
Telephony software essentially provides free telephone calls anywhere in the world. However, the
hallenge of IP Telephony is maintaining the quality
c
controllers resolve this issue by providing quality assurance comparable to legacy telephone system
VR IVR is a software application that accepts a
I
keypad selection and provides appropriate responses in the form of voice, fax, callback, e-mail and
perhaps other media.
Grandstream Networks, Inc. GXP-2000 Users Manual Page 31 of 33
Firmware 1.1.1.14 Last Updated: 12/2006