BigBlueButton内部音频控件是通过WebRTC技术实现的，可以通过修改配置文件启用或禁用。以下是启用内部音频控件的示例代码：

1. 修改bbb-conf.conf 文件

打开 bbb-conf.conf 配置文件，找到以下代码段：

Audio configuration

The FreeSWITCH voice conference for guests

Note: You should only use this option for guests. Users should use voiceIP or voiceExternalIP

voiceFreeSWITCHHostname=localhost

voiceFreeSWITCHPort=5066

voiceFreeSWITCHPassword=BBBFTW

Use FreeSWITCH for recording

Note: You should only use this option if you want recording to be possible on this server

note that recording only works if you are using a single server setup

voiceFreeSWITCHRecordingHostname=localhost

voiceFreeSWITCHRecordingPort=5066

voiceFreeSWITCHRecordingPassword=BBBFTW

When using Voice-over-IP (VoIP) and dialing outside of a browser, BigBlueButton

uses this IP address to access FreeSWITCH for voice processing (such as echo cancellation).

This IP should be accessible from the computer running the Flash client.

By default, this is set to the IP address of the BigBlueButton server.

voiceIP=192.168.1.22

When using Voice-over-IP (VoIP) and dialing into a browser session,

this is the IP of the FreeSWITCH server that BigBlueButton will use to process

the incoming audio. If you are not using any PSTN integration, you can safely

set this to the same IP address as voiceIP. However, if you are using PSTN

integration you need to set this to the IP address that your PSTN gateway uses

to connect to the FreeSWITCH server.

voiceExternalIP=192.168.1.22

Turn on/off the internal FreeSWITCH echo canceller.

For voice over IP, echo can be a problem and if you are not experience the level of

echo cancellation you'd like, try turning this option on. This will enable FreeSWITCH's

internal echo canceller.

If this value is set to true, it will allow you to use the echo test (see Test menu at top of client).

Note that echo cancellation can cause the audio to sound slightly distorted if not done well,

so you are encouraged to do a test with a large number of users before using it in production.

voiceUseEchoCanceller=false

Set to true to enable WebRTC audio processing (like noise suppression).

By default, it is turned off.

voiceUseWebRTC=true

Use this option if you are using voiceIP

voicePort=5060

Use this option if you are using voiceExternalIP

voiceExternalPort=5060

取消注释voiceUseWebRTC，并将其设置为true，即：

voiceUseWebRTC=true