Cisco SR520-FE-K9 Administration Manual page 172

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Third Preferred Codec
Use Pref Codec Only
Silence Supp Enable
Silence Threshold
G729a Enable
Echo Canc Enable
Echo Canc Adapt
Enable
Echo Supp Enable
FAX V21 Detect Enable
Cisco SRP500 Series Services Ready Platforms Administration Guide (SRP520 Models)
Third 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:.Unspecified, G711u, G711a, G726-16,
G726-24, G726-32, G726-40, G729a, or G723.
The default is Unspecified.
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.
To enable silence suppression so that silent audio
frames are not transmitted, select yes. 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 G.729a 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.
To enable the echo canceller to adapt, select yes.
Otherwise, select no.
The default is yes.
To enable the use of the echo suppressor, select yes.
Otherwise, select no.
The default is yes.
To enable detection of V21 fax tones, select yes.
Otherwise, select no.
The default is yes.
Configuring Voice
Configuring Voice Settings