Cisco 8800 Series Administration Manual page 349

Cisco IP Phone Troubleshooting
Parameter
Third Preferred Codec
G711u Enable
G711a Enable
G729a Enable
G722 Enable
G722.2 Enable
iLBC Enable
iSAC Enable
OPUS Enable
Silence Supp Enable
DTMF Tx Method
Description
Codec to use if the second codec fails.
Default: Unspecified
Enables use of the G.711u codec.
Default: Yes
Enables use of the G.711a codec.
Default: Yes
To enable use of the G.729a codec at 8 kbps, select
Yes. Otherwise, select No.
Default: Yes
Enables use of the G.722 codec.
Default: Yes
Enables use of the G.722.2 codec.
Default: No
Enables use of the iLBC codec.
Default: Yes
Enables the use of iSAC codec.
Default: Yes
Enables the use of OPUS codec.
Default: Yes
To enable silence suppression so that silent audio
frames are not transmitted, select Yes. Otherwise,
select No.
Default: No
The method for transmitting DTMF signals to the far
end. The options are:
• AVT—Audio video transport. Sends DTMF as
AVT events.
• InBand—Sends DTMF by using the audio path.
• Auto—Uses InBand or AVT based on the
outcome of codec negotiation.
• INFO—Uses the SIP INFO method.
Cisco IP Phone 8800 Series Multiplatform Phones Administration Guide
Audio Configuration
333