Instruction manual

2-102
BreezeACCESS Version 4.5 Operations and Administration
Manual Revision: 1.0
Voice Parameters
The parameters in the Voice Parameters menu include the following
options:
! Volume – Sets the gain of the voice signal to the earphone.
Available range is 0 dB to -20 dB in 1 dB steps.
The default value is -3 dB.
! Echo Cancellation – Enables or disables the built-in echo
cancellation feature.
The default value is Enable.
! Voice Codec – Specifies the relative priority of the codecs. The units
support the following codecs:
" G723.1 (6.4 Kbps rate, 1:10 compression ratio)
" G729 (8 Kbps rate, 1:8 compression ratio)
" G711 Ulaw (64 Kbps, no compression, US standard)
" G711 Alaw (64 Kbps, no compression, European Standard)
" G729AnnexA (G729 with reduced complexity)
" G729wAnnexB (G729 with silence compression)
" G729Annex AwAnnexB (G729 with reduced complexity and
silence compression)
You can enter a list of one to seven codecs, specifying the relative
priorities to be offered during capabilities’ exchange according to the
H.323 standard. For example, enter 1 to always use the G.723.1
codec. Enter 2, 1, 3, 4 to set the priorities according to the following
order: G729, G723.1, G711µlaw, G711 Alaw.
The range is 1 to 7654321, using digits 1 to 7.
The default is 2134.
! Compression Efficiency – Specifies the number of voice frames to
be packed into one RTP (Real Time Protocol) frame. The higher the
value of the Frames per Packet parameter, the higher are the delay
introduced (reduced quality) and the higher is the number of
simultaneous voice sessions that can be supported by the AU. There
is a separate setting for each of the voice codecs that are supported
by the unit.
The allowed range differs among codecs, in accordance with the
different packet sizes (30 ms for G723.1, 10 ms for G729 and 5 ms
for G711).
The valid values and default values are:
" G723 Frames Per Packet – Valid range 1-8, Default value is 2
" G729 Frames Per Packet – Valid range is 1-12, Default value is
6. If upgrading from a previous version, this value must be set to