Grandstream Networks Grandstream BudgeTone 200 User Manual download pdf (Page 52)

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 behaviour 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

i.e. 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

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Grandstream Networks Grandstream BudgeTone 200 User Manual Page 52