This is a middle aged man that uses an automated system to call. That's why you get the immediate hold message.It's always the same man and he is spoofing Delta Outsource group. This is not the only number he uses. He obviously works a day job as well because the calls are in early mornings/late evenings at completely unprofessional times. He will immediately say you have a debt and try to collect credit card information to "pay a reduced rate".