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ATA Voice Field Reference
PSTN Line page (SPA3102)
ATA Administration Guide 198
B
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 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.
Silence Supp
Enable
To enable silence suppression so that silent audio frames
are not transmitted, select yes. Otherwise, select no.
The default is no.
Use Pref Codec
Only
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.
Silence Threshold Select the appropriate setting for the threshold: high,
medium, or low.
The default is medium.
G729a Enable To enable the use of the G729a codec at 8 kbps, select
yes. Otherwise, select no.
The default is yes.
Echo Canc Enable To enable the use of the echo canceller, select yes.
Otherwise, select no.
The default is yes.