Following a reboot, the IP Office will try using TFTP to download a file called holdmusic.wav. The file properties should be: PCM, 8kHz 16-bit, mono, maximum length 30 seconds.
The initial source for download is the system's configured TFTP server (System | System | TFTP Server IP Address). The default for this is a broadcast to the local subnet for any PC running a TFTP server.
Manager acts as a TFTP server while it is running. If Manager is used as the TFTP server then the holdmusic.wav file should be placed in the Manager applications working directory.
If no successful TFTP download occurs, the IP Office will automatically look for a holdmusic.wav file on the control unit's compact flash memory card if present and will download that file. (Small Office Edition and IP406 V2 control units with IP Office 3.1 or higher)
If IP Office has not loaded a hold music file it will retry loading a hold music file approximately every five minutes.
If an internal music on hold file is downloaded, the IP Office will automatically write a copy of that file to its compact flash memory card if present. This will overwrite any existing music on hold file stored on that card. (Small Office Edition and IP406 V2 control units with IP Office 3.1 or higher)
If an internal music on hold file is downloaded, that file is used and overrides any external music on hold source if also connected.
All the above operation can be cancelled by selecting Use External Music on Hold (System | Telephony) and restarting the IP Office.