CounterPath X-Lite 3.0 User Guide - Manual (Page 65)

CounterPath X-Lite 3.0
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Appendix F: Glossary
AEC Acoustic echo cancellation. Processing of audio data to reduce the echo effect that can
arise if the sound from a speakerphone or headphone leaks into the microphone input
device.
AGC Automatic gain control. Processing of audio data to adjust the microphone volume
level so that a remote party does not hear distortions that may be caused by a
microphone input level that is too high or a volume that is too low (due to a low input
level).
AVI Audio Video Interleave. A multimedia container format. AVI files contain both audio
and video data in a standard container that allows simultaneous playback.
Broadband Broad or wide bandwidth. In data transmission, the wider the band, the more data can
transmit during a given time span. A cable or xDSL connection to the network
provides broadband for data transmission. A dialup or ISDN connection provides a
narrow bandwidth for data transmission.
Codec The format by which audio or video streams are compressed for transmission over
networks.
Dialing plan The rules that X-Lite follows to interpret user input and to modify the number or
address, as required, to ensure that the call will be placed successfully.
DTMF Dual-tone multifrequency. 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 clicking
keys on the dialpad or pressing keys on the keyboard.
IM Instant Messaging. A technology that lets users send text message and files for near
instantaneous delivery and display on another computer.
IP Internet Protocol. A data-oriented protocol used for communicating across a network.
IP is the most common protocol used on the internet.
IP address A unique number that devices use to identify each other on an IP-based computer
network.
Media In a VoIP phone call, the audio and video portion of the call information. Compare to
“Signaling.”
MWI Message Waiting Indicator. An indicator notification of voicemail messages waiting
for the owner of a given SIP account.
Narrowband Narrow bandwidth. In data transmission, the wider the band, the more data can
transmit during a given time span. A cable or xDSL connection to the network
provides broadband for data transmission. A dialup or ISDN connection provides a
narrow bandwidth for data transmission.
Presence A communication feature that allows users to share real-time information about their
availability, mood, location, etc.
Proxy See SIP account.
PSTN Public Switched Telephone Network. The traditional land-line phone network.