User guide

GLOSSARY 296
SIP server
A server using the SIP protocol to manage calls between SIP devices.
Serial port
Serial ports are physical plug-ins. They allow two devices to exchange data.
SMTP
Simple Mail Transfer Protocol. The standard for e-mail transmission across the Internet. SMTP is
a text-based protocol.
Terminal adapter
A device that allows analog devices to be used on digital lines (ISDN). Terminal adapters are
similar to modems.
TX/RX
Transmit and receive data.
UDP
User Datagram Protocol. An Internet protocol which allows applications on a computer network
to exchange short messages (datagrams).
uPnP
Universal Plug and Play. Allows networked devices to connect seamlessly in home and corporate
environments using Internet-based communication standards.
USB
Universal Serial Bus. USB connection supports more bandwidth than a serial or
parallel connection.
Virtual
The term ‘virtual’ refers to something that is not physically plugged in.
Voicemail (call answer)
A service provided by TalkSwitch or telephone companies giving callers the opportunity to leave
a message when your phone is busy or unanswered.
VoIP
Voice over IP. Sending voice over an Internet connection.
VPN
Virtual Private Network. A communication network used within a company or organization to
communicate over a public network. VPN message traffic is carried on Internet infrastructure
using standard protocols.