AudioCodes Mediant 800 - Page 444

CHAPTER19 Coders and Profiles
Mediant 800 Gateway & E-SBC | User's Manual
● For supported audio coders, see Supported Audio Coders.
● Some coders are license-based and are available only if included in the License
Key installed on your device. For more information, contact the sales
representative of your purchased device.
● Only the packetization time of the first coder listed in the Coder Group is declared in
INVITE/200 OK SDP even if multiple coders are configured. The device always
uses the packetization time requested by the remote side for sending RTP
packets. If not specified, the packetization time is assigned the default value.
● The value of some fields is hard-coded according to common standards (e.g.,
payload type of G.711 U-law is always 0).
● The G.722 coder provides Packet Loss Concealment (PLC) capabilities, ensuring
higher voice quality.
● Opus coder:
✔ For SBC calls: If one leg uses a narrowband coder (e.g., G.711) and the other
leg uses the Opus coder, the device maintains the narrowband coder flavor by
using the narrowband Opus coder. Alternatively, if one leg uses a wideband
coder (e.g., G.722) and the other leg uses the Opus coder, the device
maintains the wideband coder flavor by using the wideband Opus coder.
✔ Gateway calls always use the narrowband Opus coder.
● For more information on V.152 and implementation of T.38 and VBD coders, see
Supporting V.152 Implementation.
● The G.729 coder refers to G.729A if silence suppression is disabled, or G.729AB if
silence suppression is enabled.
The following procedure describes how to configure the Coder Groups table through the Web
interface. You can also configure it through ini file [AudioCodersGroups] and [AudioCoders], or CLI
(configure voip > coders-and-profiles audio-coders-groups).
➢ To configure a Coder Group:
1. Open the Coder Groups table (Setup menu > Signaling & Media tab > Coders & Profiles
folder > Coder Groups).
2. From the 'Coder Group Name' drop-down list, select the desired Coder Group index number
and name.
3. Configure the Coder Group according to the parameters described in the table below.
4. Click Apply, and then reset the device with a save-to-flash for your settings to take effect.
You can delete a Coder Group, as described in the following procedure.
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