Appendix B - Glossary User’s Manual (SIP Version)
Mediatrix 1104
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Off-hook A line condition caused when a telephone handset is removed from its
cradle.
On-hook A line condition caused when a telephone handset is resting in its
cradle.
Packet Group of bits transmitted as a complete package on a packet-switched
network.
Port Network access point, the identifier used to distinguish among multiple
simultaneous connections to a host.
Private Branch
Exchange (PBX)
A small to medium sized telephone system and switch that provides
communications between onsite telephones and exterior
communications networks.
Protocol Defines a common set of rules and signals that computers on the
network use to communicate.
Public Switched
Telephone Network
(PSTN)
The local telephone company network that carries voice data over
analog telephone lines.
Server A computer or device on a network that works with a client to perform
some operation.
Session Initiation
Protocol (SIP)
Protocol for transporting call setup, routing, authentication, and other
feature messages to endpoints within the IP domain.
Simple Network
Management Protocol
(SNMP)
Protocol governing network management and the monitoring of
network devices and their functions.
Switched Circuit
Network (SCN)
A communication network, such as the Public Switched Telephone
Network (PSTN), in which any user may be connected to any other
user through the use of message, circuit, or packet switching and
control devices.
T.38 An ITU-T Recommendation for Real-time fax over IP. T.38 addresses
IP fax transmissions for IP-enabled fax devices and fax gateways,
defining the translation of T.30 fax signals and Internet Fax Protocols
(IFP) packets.
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