Siemens M1 - Manual (Page 46)

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GSM M1 Module, English: A24859-N4000-A100-1-7677 gsm-m1-e.fm
Technical reference section
6.3.96
Example:
You wish to set the SN mode to fax/data:
Enter: AT+CXXSN=2
GSM module: OK
AT+CXXSN=?
Command AT+CXXSN=?
Result code +CXXSN: <0,1,2>
Meaning of the mode
0 The next incoming call will be answered by the voice service
(TS11).
1 The next incoming call will be answered by the voice/fax service.
This is required if your network operator supports only TS61 and
not TS62.
2 The next call will be answered by the fax or data service, depend-
ing on the active application on your PC. If a fax application is
active, the module answers the call as a fax call.