Cisco 6800 Series Administration Manual page 304

Audio Configuration
Parameter
G711u Enable
G711a Enable
G729a Enable
G722 Enable
G722.2 Enable
iLBC Enable
OPUS Enable
Silence Supp Enable
DTMF Tx Method
Codec Negotiation
Cisco IP Phone 6800 Series Multiplatform Phones Administration Guide
290
Description
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 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.
When set to Default, the Cisco IP phone responds to
an Invite with a 200 OK response advertising the
preferred codec only. When set to List All, the Cisco
IP phone responds listing all the codecs that the phone
supports. The default value is Default, or to respond
with the preferred codec only.
Phone Troubleshooting