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Specifies the audio source. Sources can be an uploaded music file (File) or live audio sourced from an FXS port (Live). Default option is File. If you select Live, the FXS Port option is displayed.

When uploading a Music file, the maximum file sizes are as follows:

• For Sonus SBC 1000: 1MB1MiB
• For Sonus SBC 2000: 4MB4MiB
• For SWe Lite: 1MiB

Music files must be one of the following formats:

• WAV
• PCMA (not supported in SWe Lite)
• PCMU (not supported in SWe Lite)
• PCM (not supported in SWe Lite)

For detailed information about how to upload a Music on Hold file, see Uploading Music on Hold Files - SBC SWe Lite or Uploading Music on Hold Files - SBC Edge.

Note: Field applies to SBC 1000/2000 only.

Specifies the type of Line Echo Cancellation (standard or dual filter).

The standard LEC covers 128ms tail length (echo delay) and employs a 24ms sparse (non-zero coefficients) filter. The Dual Filter (background and foreground) Line Echo Canceller (LEC) covers 128ms tail length and uses 48ms sparse foreground filter. The Dual Filter is expected to provide better performance during double talk or slow echo-path change. Selection of the Dual Filter option may result in reduced channel densities.

Note: Field applies to SBC 1000/2000 only.

Specifies the level of echo cancellation employed by the SBC Nonlinear Signal Processor.

The default value is Mild. However there are two additional levels of echo cancellation, Strong and Aggressive. As each telephony system implementation varies, their echo characteristics similarly vary. Adjust the level of echo cancellation to suit your particular deployment. Too little cancellation may result in a persistent echo, too aggressive and you may experience voice "clipping".