Your English seems pretty good. I have the English versions of the U.S. manuals here:
Directory listing Yes, you can program from a phone plugged into jack 01 (ext 101). moh is Music On Hold. In addition to the 803 program command, there are additional information bits programmed in 990 and 991. When you press 990 and 02, it will display 16 data bits 1110011000101100 The 10th bit from the right is 1 by default and it needs to be set to 1 if it isn't.
Carl