VEGA INSYS Modem GPRS 5.0 - Manual (Page 60)

Functions INSYS GPRS 5.0 serial
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tion will be sent to the remote terminal only after the CSD connec-
tion is ended.
If data is transmitted via GPRS during the CSD call (e.g. via a TCP
connection), it may occur that the caller receives the BUSY signal. In
this case, the dial-in should be repeated. The rule of thumb would
be that the CSD call will be forwarded after a minimum of approxi-
mately 30 seconds after the last data byte was transmitted via
GPRS.
o A GPRS dial-in (TCP Listen mode, waiting for incoming TCP connection): In
this case, the TCP Listen mode is terminated for the duration of the CSD call
(+PPP-IP RELEASE), and restarted afterwards (+PPP-IP SETUP).
Due to the additional time which is required to terminate the TCP or the GPRS connec-
tion, the caller must be prepared for a slightly longer waiting period until the connection
is accepted. Example: If the INSYS GPRS 5.0 serial is set using ATS0=2 for accepting CSD
connections after two ring tones, in general actually 5 to 6 ring tones (RINGs) are re-
quired. Please set the number of rings to a minimum of three rings to ensure full func-
tionality, if you want to use automatic call answering.
6.3.1 CSD priority with caller authentification
Alternatively, our example can be set using the terminal program:
In general, activate selective call acceptance
Enter allowed phone number 1
AT**CLIP=1
AT**CLIP1=+49941586920
Activate CSDPRIO AT**CSDPRIO=1