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Availability: Since 6.1.2


For SWe Lite Music On Hold, refer to Configuring SBC SWe Lite for Music On Hold

System and Music File Requirements

  • SBC Edge must be running version 2.1 or later.
  • Music files must be one of the following formats:
    • WAV
    • PCMA
    • PCMU
    • PCM

Table : Maximum File Size


File Size

SBC 1000

1 MiB

SBC 2000

4 MiB


Providing the Audio Source

To upload a music (sound) file:

Upload the file using the Uploading a Sound File procedure in Uploading Music on Hold Files - SBC Edge.

To connect a live audio source through an FXS port:

Specify the live audio source using the Specifying a Live Audio Source procedure in Configuring the Media System.

Connecting an audio source for Music On Hold requires the use of an adapter betweenSBC Edge RJ11 port and the source device (CD player, radio, iPod. MP3 player, personal computer, etc.). Common adapters include a 3.5mm connector on one end and an RJ11 on the other with an isolation transformer between the two.

Music On Hold volume is controlled from the audio source device (iPod, MP3 Player, etc.). The preferred volume level can be adjusted by listening to the stream, or by examining the RTP trace captured from the SIP call leg of the call. Use the receive gain settings on the FXS port to make any additional fine-tuning volume adjustments.

Selecting the Music On Hold Mode

 Enable Music on Hold as follows:

  1. From the Music on Hold drop down list (via applicable SIP Signaling group) select Enabled for SDP Inactive or Always Enabled.
  2. Click Apply.

Verifying Music Upload Status and FXS Music On Hold source.

To verify that the file has been successfully uploaded:

  1. In the WebUI, click the Settings tab.

  2. In the left navigation pane, go to System > DSPs.

The Music on Hold File Status will show as Loaded if the file was successfully uploaded.

Figure : Verify Upload


If your system does not have transcoding licenses, be sure your MOH file is encoded in the same Law as your calls use. For instance, if you're using A-Law for your calls, be sure to use an A-law encoded MOH file.

If your system has transcoding licenses, then the system will automatically transcode between different types of codec compressions.

Under certain conditions, after multiple, consecutive attended transfers, Music On Hold will not be heard on the SIP phone when the call is put on hold.