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ATA Voice Field Reference
PSTN Line page (SPA3102)
ATA Administration Guide
Voice tab > PSTN Line page >
Audio Configuration section
A codec resource is considered as allocated if it has been included in the SDP
codec list of an active call, even though it eventually may not be the one chosen for
the connection. So, if the G.729a codec is enabled and included in the codec list,
that resource is tied up until the end of the call whether or not the call actually uses
G.729a. If the G729a resource is already allocated and since only one G.729a
resource is allowed per device, no other low-bit-rate codec may be allocated for
subsequent calls; the only choices are G711a and G711u. On the other hand, two
G.723. 1 /G.726 resources are available per device.
Therefore it is important to disable the use of G.729a in order to guarantee the
support of two simultaneous G.723/G.726 codec.
Preferred Codec
Silence Supp
Enable
Use Pref Codec
Only
Silence Threshold
G729a Enable
Echo Canc Enable
Preferred codec for all calls. (The actual codec used in a
call still depends on the outcome of the codec negotiation
protocol.) Select one of the following: G711u, G711a,
G726-16, G726-24, G726-32, G726-40, G729a, or G723.
The default is G711u.
To enable silence suppression so that silent audio frames
are not transmitted, select yes. Otherwise, select no.
The default is no.
To use only the preferred codec for all calls, select yes.
(The call fails if the far end does not support this codec.)
Otherwise, select no.
The default is no.
Select the appropriate setting for the threshold: high,
medium, or low.
The default is medium.
To enable the use of the G729a codec at 8 kbps, select
yes. Otherwise, select no.
The default is yes.
To enable the use of the echo canceller, select yes.
Otherwise, select no.
The default is yes.
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