Grandstream Networks Grandstream GXV-3000 User Manual download pdf (Page 45)

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Firmware 1.0.1.7 Updated: 06/2007

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 per-

haps other media.

MTU A Maximum Transmission Unit (MTU) is the largest size packet or frame, specified in octets (eight-

bit bytes), that can be sent in a packet- or frame-based network such as the Internet. The maximum for

Ethernet is 1500 byte.

NAT Network Address Translation

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 be-

havior 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 network.

Public VoIP service providers use OBP/SBCs to allow the use of VoIP protocols from private networks

with

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

called POT (Plain Old Telephone), or circuit switched network.

RTCP Real-time Transport Control Protocol, defined in

RFC 3550, a sister protocol of the Real-time

Transport Protocol (RTP), It partners RTP in the delivery and packaging of multimedia data, but does not

transport any data itself. It is used periodically to transmit control packets to participants in a streaming

multimedia session. The primary function of RTCP is to provide feedback on the quality of service being

provided by RTP.

RTP Real-time Transport Protocol defines a standardized packet format for delivering audio and video

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 parameters. It

has been published by the

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 for integrated voice-data applications. SIP is designed for voice

transmission and uses fewer resources and is considerably less complex than H.323. All Grandstream

products are SIP based

STUN 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.

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