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Side Tone
Short echoes with a delay shorter than approximately 5ms and an attenuation > 15dB.
Subject
A test person evaluating the stimuli in a listening test.
TAPI
Telephony application protocol interface
An application protocol interface defined by Microsoft.
ToS
Type of Service
Termination
This is the far end of a telephone conversation. In general this is the party which receives a phone call. In
older OPERA versions this was the "Called" telephone line.
VAD
Voice Activity Detection. VAD is part of most VoIP systems and Echo cancelers. It is used to distinguish
active speech from silence.
VoIP
Voice over Internet Protocol
Voice over Internet Protocol, a series of techniques permitting transmission of telephony over the Internet.
Often makes use of ITU-T G.7xx audio compression recommendations.
WFQ
Weighted Fair Queuing
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