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GXV-3000 User Manual Grandstream Networks, Inc.
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Simple Traversal of UDP over NATs, is a network protocol allowing clients behind NAT (or
multiple 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 set up UDP
communication between two hosts that are both behind NAT routers. The protocol is defined in
RFC 3489. 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.
UDP
User Datagram Protocol (UDP) is one of the core protocols of the Internet protocol suite. Using
UDP, programs on networked computers can send short messages known as datagrams to one
another. UDP does not provide the reliability and ordering guarantees that TCP does;
datagrams may arrive out of order or go missing without notice. However, as a result, UDP is
faster and more efficient for many lightweight or time-sensitive purposes.
VAD
Voice Activity Detection or Voice Activity Detector is an algorithm used in speech processing
wherein, the presence or absence of human speech is detected from the audio samples.
VLAN
A virtual LAN, known as a VLAN, is a logically-independent network. Several VLANs can co-
exist on a single physical switch. It is usually refer to the IEEE 802.1Q tagging protocol.
VoIP
Voice over IP
VoIP encompasses many protocols. All the protocols do some form of signaling of call capa-
bilities and transport of voice data from one point to another. e.g.: SIP, H.323, etc.