CounterPath X-Lite 4 for Mac User Guide - Manual (Page 56)

CounterPath Corporation
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D Glossary
AEC Acoustic echo cancellation. Processing of the audio signal to reduce the echo effect
that can arise with a speakerphone or that can arise if the sound from the
speakerphone or headphone leaks into the microphone.
AGC Automatic gain control. Processing of the audio to adjust the microphone volume
level so that the other party does not hear the distortion that might be caused by too
high a microphone input or too low volume (due to too low input level).
Broadband Broad or wide bandwidth. In data transmission, the wider the band, the more data it is
possible to transmit in a given time span. A cable, DSL and ADSL connection to the
network provide broadband for data transmission. A dialup or ISDN connection
typically provide a narrow bandwidth for data transmission.
Codec The format by which audio streams are compressed for transmission over networks.
Default account The SIP account that will be used when placing an outgoing call, if X-Lite does not
determine that another account should be used. X-Lite uses the dial plan to determine
the account to use.
Dial plan The rules that X-Lite follows in order to interpret the softphone address or phone
number that the user has entered and to modify the number or address, as required, to
ensure that the call will be placed successfully.
DTMF Dual-tone multi frequency. DTMF is the system that is used in interactive voice-
response menu systems such as the menu system for accessing voicemail messages.
The DTMF system allows the user to interact with the menu by pressing keys on a
dialpad or keyboard.
IM Instant Messaging. A technology that lets users send text message and files for near
instantaneous delivery and display on each others’ computers.
IP Internet Protocol. A data-oriented protocol used for communicating data across a
network. IP is the most common protocol used on the internet.
IP address A unique number that devices use in order to identify and communicate with each
other on a computer network using the IP standard.
Media In a VoIP phone call, the audio portion of the information in a call. Compare to
“Signaling”.
MOV The Mac QuickTime multimedia container format. MOV files contain audio data in a
standard container that allows simultaneous playback.
MWI Message Waiting Indicator. An indicator that there is a voicemail message for the
owner of an account.
Narrowband In data transmission, the wider the band, the more data it is possible to transmit in a
given time span. A cable, DSL and ADSL connection to the network provide
broadband for data transmission. A dialup or ISDN connection typically provide a
narrow bandwidth for data transmission.
Presence An instant messaging feature that allows users to share information about their
availability, mood, location and so on.
Proxy See SIP account.
PSTN Public Switch Telephone Network. The traditional land-line phone network.
RFC Request for Comment. A document that describes an aspect of an internet technology.
An RFC may be a proposed, draft or full internet standard.
RTP Real-time Transport Protocol. A protocol for delivering the media portion of a data
transmission over an IP network. SRTP is another media protocol.