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CHAPTER37 Advanced SBC Features

Mediant 800 Gateway & E-SBC | User's Manual

■ Managed Opus or Managed G.729: If the SBC detects WAN network impairments during a

call using the Opus or G.729 coder between the Enterprise SBC and Access SBC, it can

adjust the coder's attributes (e.g., bit rate) for that specific call to ensure high voice quality is

maintained. The advantage of these coders is that their bit rate can change dynamically

according to bandwidth availability. This mode is useful for unstable networks, allowing the

coders to dynamically adapt to adverse network conditions.

For Managed Opus, the Enterprise SBC performs transcoding from G.711 (used between

Enterprise phones and SBC) to Opus (used between Enterprise and Access SBCs). For

Managed G.729, the G.729 coder is used by all the involved entities and therefore, transcoding

is not needed. For Managed G.729 operating in an MPLS environment, voice quality can also be

maintained, as mentioned previously.

Figure 37-1: VoIPerfect Managed Opus

Figure 37-2: VoIPerfect Managed G.729

Configuration of the Enterprise SBC:

● Coder Groups table (see Configuring Coder Groups): Coder Group with Opus or G.729

(depending on Managed coder)

● Allowed Audio Coders Groups table (see Configuring Allowed Audio Coder Groups):

Allowed Audio Coder Group with Opus or G.729 (depending on Managed coder)

● IP Profiles table (see Configuring IP Profiles):

◆ (Managed Opus Only) 'Extension Coders Group': Select the Coders Group for Opus

◆ 'Allowed Audio Coders': Select the Allowed Audio Coders Group with Opus or G.729

(depending on Managed coder)

◆ 'Allowed Coders Mode': Restriction

◆ 'Voice Quality Enhancement': Enable

◆ 'RTCP Feedback': Feedback On

◆ (Managed Opus Only) 'Max Opus Bandwidth': 0

◆ (Managed G.729 Only) 'Jitter Compensation': Enable

◆ (Managed G.729 Only) 'RTCP Mode': Generate Always

◆ (Managed G.729 Only) 'Dynamic Jitter Buffer Minimum Delay': 40

◆ (Managed G.729 Only) 'Jitter Buffer Max Delay': 500

● (Managed G.729 Only) MPLSMode (ini file parameter): 0 if no MPLS; 1 if operating in an

MPLS environment

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AudioCodes Mediant 800 User Manual

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