Xerox DocuColor 2240 Service Manual page 528

83-724 DCN Received after FTT
DCN received after transmitting FTT.
Procedure
Switch power off then on. Re-try the Fax job
Sender side failure; line quality no good
Initial issue
DC 3535/2240/1632, WC M24
83-725 No Mailbox/Relay
Destination has no Mailbox or relay-broadcast capability
Procedure
remote terminal failure (no equivalent ability);
09/03
2-495
Status Indicator RAPs
83-724, 83-725