Grandstream Networks GXW400x Manual De Usuario

 

Grandstream Networks, Inc. 

Page 29 of 31  

 

 

FQDN  Fully Qualified Domain Name.  A FQDN consists of a host and domain name, including top-level 
domain. For example, 

 is a fully qualified domain name. www is the host, 

Grandstream is the second-level domain, and and.com is the top level domain.  
 
FXS  Foreign eXchange Office.  An FXS 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 FXS interface will accept calls from FXS or PSTN interfaces. All countries and regions have 

their own standards.  

•  FXS is complimentary to FXS (and the PSTN).  

 
FXS  Foreign eXchange Station.  An FXS device has hardware to generate the ring signal to the FXS 
extension (usually an analog phone).  

•  An FXS device will allow any FXS device to operate as if it were connected to the phone 

company. This makes your PBX the POTS+PSTN for the phone.  

•  The FXS Interface connects to FXS devices (by an FXS interface, of course).  

 
DHCP  The Dynamic Host Configuration Protocol (DHCP) is an Internet protocol for automating the 
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 

 to describe the process of removing 

 from a voice communication in order to improve voice quality on a 

improving quality, this process improves 

 savings achieved through 

 by 

preventing echo from traveling across a 

.  There are two types of echo of relevance in telephony: 

acoustic echo and hybrid echo. 

 techniques and 

contribute to echo generation in 

. 

 
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 retrieve 
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 
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 packet-switched 
networks; the process is reversed at the receiving end. The terms IP Telephony and Internet Telephony 
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.  
 
IVR  IVR is a software application that accepts a combination of voice telephone input and touch-tone 
keypad selection and provides appropriate responses in the form of voice, fax, callback, e-mail and 
perhaps other media.