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R

Word Explanation
RADIUS

RADIUS stands for Remote Authentication Dial In User Service and is the standard protocol for an authentication server (also known as an AAA server â?? authentication, authorizing and accounting server). Used by ISPs, its function is to authenticate the user who tries to connect to an ISP, authorize his access and also keep a check on the amount of time he uses the ISPâ??s service, for billing purposes.
RAS (Registration, Admission, Status)

RAS is a set of management standards for gatekeepers and terminals. This control channel is responsible for transmitting H.225.0 messages in an H.323 network.
RAS user

RAS user is registered using the RAS protocol with the gatekeeper of an IP telephony network.
Redundant

Redundancy is thought to be key for enhanced voice transfer services leading to better VoIP availability. Redundant common logic with efficient load sharing causes faster data path restoration, allowing several passageways for packets to traverse. This way, redundancy increases network reliability by offering alternative paths in case data transmission fails at a certain point.
REN (Ringer Equivalency number)

Indicates the extent of inserted impedance a telephone ringer may have. Popularly known as the Ringer Equivalence Number in the UK, REN in the US has been defined as per the Code of Federal Regulations. Traditional telephone systems have a REN of 1, whereas modern systems have a REN much lower than 1.
RSVP (Resource Reservation Protocol)

RSVP enables resource reservation over the Internet to ensure guaranteed QoS. For instance, online applications running on a host can use RSVP to define the type of data they want to receive.
RTP (Real-Time Transport Protocol)

RTP is a host-to-host protocol for sending real-time data over the Internet. RTP facilitates online transfer of video, audio and simulation data. The protocol defined in IETF RFC 1889, is also used in several other applications including video conferencing and VoIP.
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