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OnCell G2150I AT Command Set GPRS Commands
10-14
Network Requested PDP Context Activation
In this mode of operation, the MT 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 MT 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 MT attempt to perform a GPRS attach if it is not
already attached. Failure will result in ERROR being returned to the TE. Subsequently, the MT
will announce a network request for PDP context activation by issuing the unsolicited result code
RING to the TE, followed by the intermediate result code CONNECT. The MT 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 context 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 MT 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 rejection 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 MT 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.
Automatic Response to a Network Request for PDP
Context Activation: +CGAUTO
Description: The set command disables or enables an automatic positive response (auto-answer)
to the receipt of a Request PDP Context Activation message from the network. It also provides
control over the use of the V.25ter basic commands ‘S0’, ‘A and ‘H’ for handling network
requests for PDP context activation. The setting does not affect the issuing of the unsolicited result
code RING or +CRING.
The test command returns values of <n> supported by the MT as a compound value.
When the +CGAUTO=0 command is received, the MT will not perform a GPRS detach
if it is attached. Subsequently, when the MT announces a network request for PDP context
activation by issuing the unsolicited result code RING or +CRING, the TE may manually accept
or reject the request by issuing the +CGANS command or may simply ignore the network request.
When the +CGAUTO=1 command is received, the MT will attempt to perform a GPRS
attach if it is not already attached. Failure will result in ERROR or, if enabled, +CME ERROR
being returned to the TE. Subsequently, when the MT announces a network request for PDP
context activation by issuing the unsolicited result code RING or +CRING to the TE, this is
followed by the intermediate result code CONNECT. The MT then enters V.25ter online data state
and follows the same procedure as it would after having received a +CGANS=1 with <cid> values
specified.