VEGA INSYS Modem GPRS 5.0 - Manual (Page 55)

INSYS GPRS 5.0 serial Functions
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See also: see Chapter 5.2.2 - Defaults
Alternatively, the access control can be set using the terminal program:
Default:
For the operation within the GPRS network, an Access Point and
the GPRS access data must be selected.
Activate selective call acceptance
Enter allowed phone number 1
Enter allowed phone number 2
Enter allowed phone number 3 AT**CLIP=1
AT**CLIP1=<nr1>
AT**CLIP2=<nr2>
AT**CLIP3=<nr3>