I set up a Scheduled DND for 9:00am to 9:10am for today (Wednesday), to go directly into voicemail.
I called the VOIPo number, went directly into Voicemail.
I deleted the Scheduled DND.
I called the VOIPo number, and it still went directly into Voicemail (I kept trying for 3 minutes). I would have expected it to not going into Voicemail since I deleted the rule.
I had to create ANOTHER Scheduled DND for 9:00am to 9:10am, to be "disabled" during that time.
Only then was I able to make a call without going into Voicemail.

Upon deletion of a Scheduled DND, it should auto-disable whatever was set during that time.

Something to fix before this gets out of Beta.

Thanks,

-Craig