Version 7.2 765 Mediant 500L Gateway & E-SBC
User's Manual 39. Advanced SBC Features
Configuration of the Enterprise SBC:
• Coders Group with Opus
• Allowed Audio Coders Group with Opus
• IP Profile:
♦ 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
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:
• Device's License Key includes the SBC transcoding feature
• Coder Groups (see Configuring Coder Groups on page 429):
♦ Coders Group with G.711
♦ Coders Group with Opus
• Allowed Audio Coders Groups (see Configuring Allowed Audio Coder Groups on
page 434):
♦ Allowed Audio Coders Group with G.711
♦ Allowed Audio Coders Group with Opus
• Main IP Profile (see Configuring IP Profiles on page 438):
♦ 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
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