Does anyone have any documentation on this specificly for dnd and cf?
Currently FreeSWITCH does not support server controlled DND and CF.
It's part of CSTA which is not implemented. I've made a beta module, mod_csta which can handle server controlled DND and CF but it requires some changes to mod_sofia which have not been implemented. Specifically the changed are in the SWITCH_EVENT_NOTIFY because currently that event is too limited to handle proper SIP NOTIFYs
I'd be happy to share my beta module but it won't work unless you modify mod_sofia.
I've written a patch to mod_sofia to fix SWITCH_EVENT_NOTIFY and submitted it to jira but have not gotten a response yet.
<snip>