Siemens M101 - Manual (Page 29)

Tips & tricks, settings
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appendix.fm5 16.4.99 Gigaset V.24 Adapter dt/eng:A30853-X400-B104-3-74D1
Select Modify under Settings and activate Guest. Enter the
port, e.g. “Null-Modem Cable at COM 1”.
To enable access by the other PC, the host (controlling) and
guest (accessing), as well as the file and print sharing option
must be activated.