Grandstream Networks 200 User Manual

 

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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.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).  

 
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.  

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

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 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.