Usage: <action application="set" data="park_timeout=30:MEDIA_TIMEOUT"/>
Music On Hold Related
Per-channel hold music. Supports all audio formats and audio streams. The hold_music variable can also be set globally at vars.xml.
<action application="set" data="hold_music=silence" />
You can also use 'phrase:' to indicate to use a phrase instead of a specific file
<action application="set" data="hold_music=phrase:my_hold_music" />
For multi-tenant environment, if you want to have a separate MOH for the phone with hold button (like Polycom) that utilizes RE-INVITE with no media ip addr (0.0.0.0) for hold, you can override the hold-music values in the sip profile parameter similar to the following example: