Glossary – TANDBERG D14049.01 User Manual
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TANDBERG
VIDEO COMMUNICATION SERVER
ADMINISTRATOR GUIDE
D 14049.01
07.2007
TANDBERG
VIDEO COMMUNICATION SERVER
ADMINISTRATOR GUIDE
Term
Definition
Interworking
Allowing H.323 systems to connect to SIP systems.
IPv4
Internet Protocol version 4
Version 4 of the Internet Protocol, defined in RFC 791 [
].
IPv6
Internet Protocol version 6
Version 6 of the Internet Protocol, defined in RFC 2460 [
].
IRQ
Information Request
A request sent to an endpoint requesting information about its status.
LAN
Local Area Network
A geographically limited computer network, usually with a high bandwidth throughput.
LDAP
Lightweight Directory Access Protocol
A protocol for accessing on-line directories running over TCP/IP.
Link
In relation to the VCS, a connection between two nodes.
LRQ
Location Request
A RAS query between gatekeepers to determine the location of an endpoint.
NAPTR record
A type of DNS record.
NAT
Network Address Translation
Also known as IP masquerading. Rewriting source and destination addresses as the IP packet passes through the NAT device.
Node
In relation to the VCS, a node is one end of a link. A node can be a local subzone or a zone.
NTP
Network Time Protocol
A protocol used for synchronizing clocks.
Pipe
In relation to the VCS, a means of controlling the bandwidth used on a link.
Proxy, Proxy Server
In SIP, an intermediary entity that acts as both a server and a client for the purpose of making requests on behalf of other clients. A proxy server primarily plays the
role of routing, which means its job is to ensure that a request is sent to another entity “closer” to the targeted user. Proxies are also useful for enforcing policy
(for example, making sure a user is allowed to make a call). A proxy interprets, and, if necessary, rewrites specific parts of a request message before forwarding it.
While a proxy can set up calls between SIP endpoints, it does not participate in the call once it is set up.
RAS
Registration, Admission and Status
A protocol used between H.323 endpoints and a gatekeeper to register and place calls.
Registrar
In SIP, a server that accepts REGISTER requests and places the information it receives in those requests into the location service for the domain it handles. This
information is used to advise other SIP Proxies/Registrars where to send calls for that endpoint.
Regex
Regular Expression
A pattern used to match text strings according to a POSIX-defined syntax.
RFC
Request for Comments
A process and result used by the IETF for Internet standards.
RS-232
A commonly used standard for computer serial ports.
RTCP
RTP Control Protocol
A control protocol for RTP, defined by RFC 3550 [
].
RTP
Real-time Transport Protocol
Real time protocol designed for the transmission of voice and video. Defined by RFC 3550 [
].
SSH
Secure Shell
An encrypted protocol used to provide a secure CLI.
Glossary