Hi,
Is it possible to set a temporary DND status for ALL extensions?
I need to temporarily stop ringing ALL the phones manually for a period of time. Is it possible to do that?
You can set break times and have the extensions automatically change to "Away" but not "DND". You could write a application to do it with a CFD and the Call Control API.
That depends on what you are trying to do. As @voiptoys said you can build an application that does that or you can use office hours if this is scheduled. You can also force the system to Out of office hours with a dial code. That however will not set the extensions to DND but it will stop all incoming calls to route the out of office destination. If that is what you are after you can find the dial code for that under Settings / Dial Codes. https://www.3cx.com/docs/pbx-dial-codes/#h.665f9ex1w4m3