Music on Hold
From FreeSWITCH Wiki
Music on Hold (MOH) is not a central component, and is dependent on endpoints supporting it. Presently only SIP is supported through mod_sofia.
In the case of call waiting on a single line phone connected to an ATA, it works like this:
- Second incoming call comes in.
- Phone plays call waiting beep.
- User hits flash button.
- ATA sends a SIP INVITE message to FreeSWITCH, and in the SDP it says "sendonly"
- FreeSWITCH receives the SIP INVITE and plays the hold music (assuming correctly configured).