User guide

Technical Configuration TalkAnytime User Guide
84
Voice/Fax Parameter Definitions (cont’d)
Coder Parameters
Coder Manual or
Auto-
matic
Determines whether selection of coder is manual or automatic.
When Automatic is selected, the local and remote voice channels
will negotiate the voice coder to be used by selecting the highest
bandwidth coder supported by both sides without exceeding the
Max Bandwidth setting. G.723, G.729, or G.711 are negotiated.
In general, this should be set to Automatic.
Selected
Coder
G.711 a/u
law 64
kbps;
G.726, @
16/24/32
/40 kbps;
G.727, @
nine bps
rates;
G.723.1 @
5.3 kbps,
6.3 kbps;
G.729,
8kbps;
Net Coder
@
6.4, 7.2, 8,
8.8, 9.6
kbps
Select from a range of coders with specific bandwidths. The higher
the bps rate, the more bandwidth is used. The channel that you are
calling must have the same voice coder selected.
Default = G.723.1 @ 6.3 kbps, as required for H.323. Here 64K of
digital voice are compressed to 6.3K, allowing several simultaneous
conversations over the same bandwidth that would otherwise carry
only one.
To make selections from the Selected Coder drop-down list, the
Manual option must be enabled.
Max
bandwidth
(coder)
11 – 128
kbps
Not applicable for TalkAnytime units.
Advanced
Features
Silence
Compression
--
Not applicable for TalkAnytime units.
Echo
Cancellation
Y/N Determines whether echo cancellation is enabled (checked) for this voice
channel.
Echo Cancellation removes echo and improves sound quality. Default =
on.
Forward
Error
Correction
Y/N Not applicable for TalkAnytime units.