CounterPath eyeBeam 1.5
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Appendix F: Glossary
AEC
Acoustic echo cancelation. Processing of the audio or video 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 or video signal 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).
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 transmssion, 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 or video streams are compressed for transmission over
networks.
Default account
The SIP account that will be used when placing an outgoing call, if eyeBeam does not
determine that another account should be used. eyeBeam uses the dialing plan to
determine the account to use. You can mark one account as the default account; see
“Setting the Default Account” on page 43.
Dialing plan
The rules that eyeBeam follows in order to interpret the SIP 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 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 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 and video portion of the information in a call.
Compare to “Signaling”.
MWI
Message Waiting Indicator. An indicator that there is a voicemail message for the
owner of an account.
Narrowband
In data transmssion, 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.
