512 - No such transfer
513 - Not supported for this fnet
514 - No such search
+515 - Quota exceeded
+516 - Duplicate recipient
+517 - No such recipient
+518 - Recipient not listening
600 - Chat receipt
601 - FN state change
630 - Peer create
631 - Peer delete
632 - Peer change
+640 - Client-to-client message