Network Adapter User Manual GXW-410xv

MTU A Maximum Transmission Unit (MTU) is the largest size packet or frame, specified in octets (eight-
t. The maximum for
thernet is 1500 byte.
AT Network Address Translation
bit bytes), that can be sent in a packet- or frame-based network such as the Interne
E
N
NTP Network Time Protocol, a protocol to exchange and synchronize time over networks The port used
is UDP 123 Grandstream products using NTP to get time from Internet
OBP/SBC Outbound Proxy or another name Session Border Controller. A device used in
VoIP networks.
OBP/SBCs are put into the signaling and media path between calling and called party. The OBP/SBC
acts as if it was the called VoIP phone and places a second call to the called party. The effect of this
behavior is that not only the signaling traffic, but also the media traffic (voice, video etc) crosses the
OBP/SBC. Without an OBP/SBC, the media traffic travels directly between the VoIP phones. Private
OBP/SBCs are used along with
firewalls to enable VoIP calls to and from a protected enterprise ne
Public VoIP service providers use OBP/SBCs to allow the use of VoIP protocols from private networks
with
twork.
internet connections using NAT.
PPPoE Point-to-Point Protocol over Ethernet is a network protocol for encapsulating PPP frames in
Ethernet frames. It is used mainly with cable modem and DSL services.
PSTN Public Switched Telephone Network. The phone service we use for every ordinary phone call, or
port Control Protocol, defined in RFC 3550
called POT (Plain Old Telephone), or circuit switched network.
RTCP Real-time Trans
, a sister protocol of the Real-time
Transport Protocol (RTP), It partners RTP in the delivery and packaging of multimedia data, but does not
riodically to transmit control packets to participants in a streaming
ultimedia session. The primary function of RTCP is to provide feedback on the quality of service being
TP Real-time Transport Protocol defines a standardized packet format for delivering audio and video
transport any data itself. It is used pe
m
provided by RTP.
R
over the Internet. It was developed by the Audio-Video Transport Working Group of the
IETF and first
published in 1996 as
RFC 1889
SDP Session Description Protocol is a format for describing
streaming media initialization parameter
has been published by the
s. It
IETF as RFC 2327.
SIP Session Initiation Protocol, An IP telephony signaling protocol developed by the IETF (RFC3261).
SIP is a text-based protocol suitable fo
r integrated voice-data applications. SIP is designed for voice
ansmission and uses fewer resources and is considerably less complex than H.323. All Grandstream
TUN Simple Traversal of UDP over NATs is a network protocol
tr
products are SIP based
S
allowing clients behind NAT (or multiple
et up UDP communication between two
osts that are both behind NAT routers. The protocol is defined in RFC 3489
NATs) to find out its public address, the type of NAT it is behind and the internet side port associated by
the NAT with a particular local port. This information is used to s
h
. STUN will usually work well
with non-symmetric NAT routers.
TCP Transmission Control Protocol is one of the core protocols of the
Internet protocol suite. Using TCP
applications on networked hosts can create connections to one another, over which they can exchange
data or
,
packets. The protocol guarantees reliable and in-order delivery of sender to receiver data.
TFTP Trivial File Transfer Protocol, is a very simple
file transfer protocol, with the functionality of a very
basic form of
FTP; It uses UDP (port 69) as its transport protocol.
Grandstream Networks, Inc. GXW-410xv User’s Manual Page 29 of 30
Firmware 1.0.0.36 Updated: 11/2006