AudioCodes Mediant 4000 SBC User Manual page 587

User's Manual
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Smart Transcoding: If the SBC (Enterprise or Access SBC) detects WAN network
impairments during a call between the Enterprise SBC and Access SBC, the SBC
employs voice transcoding by switching the coder from G.711 to Opus for that specific
call only. Transcoding is done only on the path between the Enterprise SBC and
Access SBC. As Smart Transcoding is applied only on a per call basis, it preserves
valuable DSP resources that may be required for other functionalities. An advantage
of using the Opus coder is that it consumes less bandwidth than G.711 and
overcomes packet loss (by dynamic packet redundancy), allowing the SBC to support
more concurrent calls than with G.711 for the same bandwidth. This mode is useful for
WAN networks that are relatively stable, allowing the use of G.711 whenever possible
and switching to Opus only during adverse network conditions.
Configuration of the Enterprise SBC:
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Device's License Key includes the SBC transcoding feature
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Coder Groups (see Configuring Coder Groups on page 409):
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Allowed Audio Coders Groups (see Configuring Allowed Audio Coder Groups on
page 414):
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Main IP Profile (see Configuring IP Profiles on page 409):
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Alternative IP Profile:
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Quality of Service Rules (see Configuring Quality of Service Rules on page 320):
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Version 7.2
Extension Coders Group: Coders Group with Opus
Allowed Audio Coders: Allowed Audio Coders Group with Opus
Allowed Coders Mode: Restriction
Voice Quality Enhancement: Enable
RTCP Feedback: Feedback On
Max Opus Bandwidth: 0
Coders Group with G.711
Coders Group with Opus
Allowed Audio Coders Group with G.711
Allowed Audio Coders Group with Opus
Extension Coders Group: Coders Group with G.711
Allowed Audio Coders: Allowed Audio Coders Group with G.711
Allowed Coders Mode: Restriction
RTCP Feedback: Feedback On
Voice Quality Enhancement: Enable
Extension Coders Group: Coders Group with Opus
Allowed Audio Coders: Allowed Audio Coders Group with Opus
Allowed Coders Mode: Restriction
RTP Redundancy Mode: Enable
RTCP Feedback: Feedback On
Voice Quality Enhancement: Enable
Max Opus Bandwidth: 80000
Rule Metric: Poor InVoice Quality
587
29. Advanced SBC Features
Mediant 4000 SBC