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AT+CGATT=0
OK
4.12.1.7
D*99, Request GPRS Service "D"
This command enables the MT to perform the actions necessary for establishing communication between the terminal and the
external PDN.
The V.25ter 'D' (Dial) command causes the MT to enter the V.25ter Online Data state and together with the terminal, to start the
specified layer 2 protocol. The MT returns CONNECT to confirm acceptance of the command prior to entering the V.25ter
Online Data state. No further commands may follow on the AT command line.
The detailed behavior after the Online Data state has been entered is dependent on the PDP type, and is described briefly. GPRS
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 protocols have terminated, either as a result of an orderly shut down of the PDP or an error, the MT enters the
V.25ter command state and returns the NO CARRIER final result code.
If <called address> is supported and provided, the MT automatically sets up a virtual call to the specified address after the PDP
context has been activated.
If <L2P> and <cid> are supported, their usage is the same as in the +CGDATA command. The +CGDCONT, +CGQREQ and
other such commands may then be used in the modem initialization AT command string to set values for PDP type, APN, QoS
and so on.
If <L2P> is not supported, or is supported but omitted, the MT uses a layer 2 protocol appropriate to the PDP type.
If <cid> is not supported, or is supported but omitted, the MT attempts to activate the context using one of the following:
• Any information provided by the terminal during the PDP startup procedure. For example, the terminal may provide a PDP
type and/or PDP address to the MT.
• A prior knowledge, for example, the MT may implement only one PDP type.
Using the "Empty PDP type" No PDP address or APN is sent in this case and only one PDP context subscription record is present
in the HLR for this subscriber.
This command may be used in both normal and modem compatibility modes.
Set Command
Command
ATD*<GPRS_SC>[*
[<called_address>][*[<L2P>]
[*[<cid>]]]]#
98-08901C68-O
Response/Action
CONNECT
or:
ERROR
AT Commands Reference
223
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