When you attempt to reach the claimant by telephone and they do not answer, you may
                  be prompted to leave a voicemail message or a message with another party who answers
                  the call. For information on leaving a voicemail message or a message with someone
                  who is not the intended call recipient, see DI 22505.014A.1.b.
               When telephone contact is not possible (i.e., the claimant does not have a telephone
                  or their telephone number is no longer in service), you must send the claimant a call-in
                  letter (see DI 22505.014A.2).
               
               If the claimant calls before the CE and confirms they will attend, provide them with
                  the information in DI 22510.019D.2.b in this subsection. If the claimant says they will not attend, follow the instructions
                  in DI 22510.019C in this subsection.