Missed this call today. And I googled this number and found out from 3 other people who git the sane ROBO call from AT&T looking for the person who handles the account.
This is Birch Communications, who will tell you they represent AT&T, and try to mislead you into lowering your rates while remaining with AT&T, except you would actually be leaving AT&T and joining Birch. This is called "slamming." I was not made aware it was Birch until starting an automated confirmation process, which I immediately halted. They are purposely misleading and switching will probably cause problems with your AT&T account, especially if you have a service contract.