Cisco 8831 Administration Manual page 42

Configure Voice Codecs
To configure the voice codecs on each extension, navigate to Admin Login > advanced > Voice >
Extension. Under Audio Configuration, configure the following parameters:
Parameter
Preferred Codec
Use Pref Codec Only
Second Preferred Codec If the first codec fails, this codec is tried. Defaults to unspecified.
Third Preferred Codec
G711u Enable
G711a Enable
G729a Enable
G722 Enable
iLBC Enable
Silence Supp Enable
DTMF Tx Method
Cisco Unified IP Conference Phone 8831 for Third-Party Call Control Administration Guide
4-4
Chapter 4
Description
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
G729a
•
G729ab
•
G722
•
iLBC
•
Defaults to G711u.
To use only the preferred codecs for all calls, select Yes. (The call fails
if the far end does not support these codecs.) Otherwise, select No.
Defaults to No.
If the second codec fails, this codec is tried. Defaults to unspecified.
Enables use of the G.711u codec. Defaults to Yes.
Enables use of the G.711a codec. Defaults to Yes.
To enable the use of the G.729a codec at 8 kbps, select Yes. Otherwise,
select No. Defaults to Yes.
Enables use of the G.722 codec. Defaults to Yes.
Enables use of the iLBC codec. Defaults to Yes.
To enable silence suppression so that silent audio frames are not
transmitted, select Yes. Otherwise, select No. Defaults to No.
The method for transmitting DTMF signals to the far end. The options
are: InBand, audio video transport (AVT), INFO, Auto, InBand+INFO,
or AVT+INFO.
• InBand sends DTMF by using the audio path.
• AVT sends DTMF as AVT events.
• INFO uses the SIP INFO method.
Auto uses InBand or AVT based on the outcome of codec
•
negotiation.
Defaults to Auto.
Configure Security, Quality, and Network Features