Music when indicated as a treatment refers to the system music, not to an alternate music source. The tenant number of the active VDN determines the system music the caller hears. You can allow callers to hear a music source other than the one assigned to the active VDN, however, by directly specifying an extension for an audio source with a command such as: wait-time 30 secs hearing 4301 then music

The i-silent keyword is for use with adjunct routing-ADR/Lookahead Interflow applications. I-silent provides silence for the specified time, but it is neutral to LAI while all other wait treatments (even with 0 secs settings) provide acceptance.