AudioCodes Mediant 4000 SBC User Manual page 410


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.
Note:
•
For supported audio coders, see ''Supported Audio Coders'' on page 411.
•
Some coders are license-dependent and are available only if purchased from
AudioCodes and included in the License Key installed on your device. For more
information, contact your AudioCodes sales representative.
•
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:
√
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.
•
For more information on V.152 and implementation of T.38 and VBD coders, see
''Supporting V.152 Implementation'' on page 193.
User's Manual
Figure 20-1: Coder Group Table
410
Mediant 4000 SBC
Document #: LTRT-40203