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NAT
Network Address Translation
NTP
Network Time Protocol
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
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
the
Real-time Transport Protocol
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
, a protocol to exchange and synchronize time over
(RTP), It partners RTP in the delivery and
52
firewalls
to enable VoIP
RFC
3550, a sister protocol of
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