MC55_ATC_V04.00 Page 294 of 475 3/17/06
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11.16 ATD*99# Request GPRS service
This command causes the MT to perform whatever actions are necessary to establish a communication between
the TE and the external PDN.
The V.250 'D' (Dial) command causes the MT to enter the V.250 online data state and, with the TE, to start the
specified layer 2 protocol. No further commands may follow on the AT command line. 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 AT+CGATT and AT+CGACT commands. If the context to be used is already activated,
it will be deactivated first. This ensures that the right context parameters will be used (e.g. QoS changes since
the last context activation or the called address specified by ATD*99#).
Examples on how to use this command are provided in "Section 11.20, Using GPRS AT commands (Examples)".
To confirm acceptance of the command before entering the V.250 online data state command will respond with
CONNECT.
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.250 command state and returns NO CARRIER (for details refer to Section 11.6.1, Automatic deac-
tivation of PDP context during dial-up PPP).
Syntax
Parameter Description
IP V4 address in the form w.x.y.z, which identifies the called party; if it is provided, the MT will automatically set
up a virtual call to the specified address after the context has been activated. This parameter is currently not
used and needs not to be specified.
Layer 2 protocol to be used between the TE and MT.
"PPP" layer 2 protocol PPP
"1" layer 2 protocol PPP
Parameter specifies a particular PDP context definition (see AT+CGDCONT command). If no context is specified,
an internal context with default properties is used (see AT+CGDCONT, AT+CGQREQ and AT+CGQMIN).
1...2
Notes
• If MC55 is in dedicated mode, command returns "+CME ERROR: phone busy".
•ATD is used as a standard V.250 AT command, too.
Exec Command
ATD*99[* [<called_address>][* [<L2P>][* [<cid>]]]]#
Response(s)
CONNECT
NO CARRIER
Reference(s) PIN ASC0 ASC1 MUX1 MUX2 MUX3 Charge Last
GSM 07.07 % % % % % % ! ! %
<called_address>(str)
<L2P>(str)
<cid>(num)