I have a customer with a DXP Plus. every once in a while a call will ring in and the phones will ring, the customer will try to answer and they will only get dialtone. The person calling in hears a couple of rings, and then silence. I have replicated this one time. The provider has the hunt group set correctly, they do not have call waiting, or telco provided voicemail turned on. When I replicated the problem I was connected to the system and could see the realtime smdr records. there was no indication that the call that I placed that failed was ever seen by the smdr recorder.

The Cloud is just someone else's computer!