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Linksys SPA9000 Administrator Guide
Document Version 3.01
Chapter 6 SPA9000 Field Reference
FXS 1/2 Tab
Field Description
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.
G723 Enable To enable the use of the G723a codec at 6.3 kbps, select yes. Otherwise, select no.
The default is yes.
Echo Canc Adapt Enable To enable the echo canceller to adapt, select yes. Otherwise, select no.
The default is yes.
G726-16 Enable To enable the use of the G726 codec at 16 kbps, select yes. Otherwise, select no.
The default is yes.
Echo Supp Enable To enable the use of the echo suppressor, select yes. Otherwise, select no.
The default is yes.
G726-24 Enable To enable the use of the G726 codec at 24 kbps, select yes. Otherwise, select no.
The default is yes.
FAX CED Detect Enable To enable detection of the fax Caller-Entered Digits (CED) tone, select yes. Otherwise,
select no.
The default is yes.
G726-32 Enable To enable the use of the G726 codec at 32 kbps, select yes. Otherwise, select no.
The default is yes.
FAX CNG Detect Enable To enable detection of the fax Calling Tone (CNG), select yes. Otherwise, select no.
The default is yes.
G726-40 Enable To enable the use of the G726 codec at 40 kbps, select yes. Otherwise, select no.
The default is yes.