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Chapter 15 – GPRS Commands
Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 163
Network Requested PDP Context Activation
In this mode of operation, the modem behaves like an answering modem and accepts the normal V.25ter commands
associated with answering a call. If GPRS-specific configuration commands are required, they may be sent to the modem
as part of the modem initialization commands. The +CGAUTO command is used to select modem compatibility mode.
Automatic Response to a Network Request for PDP Context Activation S0
The V.25ter 'S0=n' (Automatic answer) command may be used to turn off (n=0) and on (n>0) the automatic response to a
network request for a PDP context activation.When the 'S0=n' (n>0) command is received, the modem attempt to perform
a GPRS attach if it is not already attached. Failure will result in ERROR being returned to the DTE. Subsequently, the
modem will announce a network request for PDP context activation by issuing the unsolicited result code RING to the
DTE, followed by the intermediate result code CONNECT. The modem then enters V.25ter online data state and follows
the same procedure as it would after having received a +CGANS=1 with no <L2P> or <cid> values specified.
Note: The 'S0=n' (n=0) command does not perform an automatic GPRS detach.
Manual Acceptance of a Network Request for PDP Aontext Activation A
The V.25ter 'A' (Answer) command may be used to accept a network request for a PDP context activation announced by
the unsolicited result code RING. The modem responds with CONNECT, enters V.25ter online data state and follows the
same procedure as it would after having received a +CGANS=1 with no <cid> value specified. It is an error to issue the 'A'
command when there is no outstanding network request.
Manual Rrejection of a Network Request for PDP Context Activation H
The V.25ter 'H' or 'H0' (On-hook) command may be used to reject a network request for PDP context activation
announced by the unsolicited result code RING. The modem responds with OK. It is an error to issue the 'H' command
when there is no outstanding network request.
Note: This is an extension to the usage of the 'H' command that is described in ITU-T V.25ter.