User guide

Developers guidelines | AT commands
216 June 2010
Extension of ATD – Request packet domain IP service
Unsolicited result codes
+CGEV GPRS event reporting
Description: The V.25ter ATD dial command causes the MT to enter the V.25ter online
data state and, with the TE, to start the specified layer 2 protocol. The MT
returns CONNECT to confirm acceptance of the command before entering
the V.25ter online data state. No further commands may follow on the AT
command line.
The detailed behaviour after the online data state has been entered is
dependent on the PDP type. It is described briefly in clause 9 (for IP) of
3GPP TS 27.060. PS attachment and PDP context activation procedures
may take place prior to or during the PDP startup, if they have not already
been performed using the +CGATT and +CGACT commands.
When the layer 2 protocol has terminated, either as a result of an orderly
shut down of the PDP or an error, the MT enters V.25ter command state
and returns the NO CARRIER final result code. <cid> usage will be the
same as in the +CGDATA command. The +CGDCONT, +CGQREQ, and so
on, commands may then be used in the modem initialisation AT command
string to set values for PDP type, APN, QoS, and so on.
If <cid> is omitted, the MT attempts to activate the context using one of
the following:
• Any information provided by the TE during the PDP startup procedure,
for example, the TE may provide a PDP type and/or PDP address to the
MT
• A priori knowledge, for example, that the MT may implement only one
PDP type
• Using the Empty PDP type (GSM 04.08). No PDP address or APN will
be sent in this case and only one PDP context subscription record will
be present in the HLR for this subscriber.
This command may be used in both normal and modem compatibility
modes.
Note: The dial string conforms to the syntax specified in GSM 02.30.
Execution
command: ATD*<GPRS_SC_IP>[*<cid>]#
Parameters:
<GPRS_SC>: Digit string. A digit string (value=’98’) which identifies a request to use
GPRS/Packet Domain with IP (PDP types IP and PPP).
<cid>: Digit string. Specifies a particular PDP context definition.
Description: This result code is enabled by using the AT+CGEREP command.
Possible unsolicited
result codes: +CGEV: X, where X is shown below.