User's Manual 428 Document #: LTRT-10632
Mediant 800B Gateway & E-SBC
Note:
• For supported audio coders, see 'Supported Audio Coders' on page 429.
• 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:
√ 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' on page 206.
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).
Figure 20-1: Coder Group Table
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
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