Siemens M1 - Manual (Page 45)

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gsm-m1-e.fm GSM M1 Module, English: A24859-N4000-A100-1-7677
Technical reference section
26.2.96
Some GSM network operators support single-numbering and some support multinum-
bering. You can determine which form of numbering is supported by your operator from
whether your chip card has one number or more than one number at which it can be
called for multiple voice or data services.
Example:
• You apply for the 9600 bit/s data and fax transmission services from your network
operator and receive 2 telephone numbers with your chip card, one for when you
wish to be called via the 9600 bit/s data service and one so that you can be reached
via the fax service. This means that your network operator supports multinumber-
ing.
• You have received only one telephone number for the 9600 bit/s data and fax ser-
vices. This means that your network operator supports single-numbering. (Single-
numbering is not supported in Germany.)
When another party wishes to reach you, your telephone must decide which service
will answer the call before it rings. If you set your GSM module to fax, all incoming
calls will be answered by the FAX service.
AT+CXXSN - Single-numbering parameterization
AT+CXXSN
Command Result
AT+CXXSN Displays the value currently set for +CXXSN.
AT+CXXSN=<SN mode> Sets the single-numbering receive mode to the rele-
vant mode.
AT+CXXSN=? Displays a list of values for single-numbering receive
modes.