Billion BiPAC 7404VNOX User Manual page 157

Codec Preference
Codec is known as Coder-Decoder used for data signal conversion. Set the priority of voice
compression; Priority 1 owns the top priority.
G.729: It is used to encoder and decoder voice information into a single packet which reduces the
bandwidth consumption.
G.711μ-LAW: It is a basic non-compressed encoder and decoder technique. μ-LAW uses pulse
code modulation (PCM) encoder and decoder to convert 14-bit linear sample.
G.711A-LAW: It is a basic non-compressed encoder and decoder technique. A-LAW uses pulse
code modulation (PCM) encoder and decoder to convert 13-bit linear sample.
G.726-32: It is used to encoder and decoder voice information into a single packet which reduces
the bandwidth consumption. Currently only supports bit rate with 32Kbps.
DTMF Method: The Inband, RFC 2833 and SIP INFO (RFC 2976) are supported.
Volume Control
Volume control helps you to adjust the voice quality of telephone to the best comfortable listening
level.
Press "-", the minus sign, to reduce either microphone or/both speaker's level of your telephone.
Press "+", the plus sign, to increase either microphone or/both speaker's level of your telephone.
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