(ACDACD is also known as Automatic Call Distribution. A system that automatically distributes incoming telephone calls to specific telephone sets based on the characteristics of the call. However, these characteristics can include an incoming phone number or options selected by a caller using an interac...) is the first date a contract may be executed. It is 28 days after the filing of the 470, and is therefore unique to each form 470The Description of Service Requested and Certification. This form opens the competitive bidding process for services listed on the form or in an RFP. It is important to note that Form 470 MUST be posted on the USAC site for 28 days before signing a contract with a provider.. The ACD can be found at the top of the form 470.