Specifications

3GPP
3GPP TS 27.007 V6.3.0 (2003-
06)
13
5
Release 6
10.2.1.1 Request Packet Domain service 'D'
Table 123: D command syntax
Command
Possible Response(s)
D*<GPRS_SC>[*[<called_address>]
[*[<L2P>][*[<cid>[,<cid>[,…]]]]]]#
CONNECT
ERROR
Description
This command causes the MT to perform whatever actions are necessary to establish 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. The MT shall return CONNECT to confirm acceptance of the command prior to entering the
V.250 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 clauses 9 (for IP) of 3GPP TS 27.060[34]. 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 shall
enter V.250 command state and return the NO CARRIER final result code.
If <called address> is supported and provided, the MT shall automatically set up a virtual call to the specified
address after the PDP context has been activated.
If <L2P> and <cid> are supported, their usage shall be the same as in the +CGDATA command. The +CGDCONT,
+CGQREQ, etc. commands may be used in the modem initialization AT command string to set values for for PDP type,
APN, QoS etc..
If <L2P> is not supported or is supported but omitted, the MT shall use a layer 2 protocol appropriate to the PDP type.
If <cid> is not supported or is supported but omitted, the MT shall attempt to activate the context using:
(a) any information provided by the TE during the PDP startup procedure, e.g. the TE may provide a PDP type
and/or PDP address to the MT,
or, (b) a priori knowledge, e.g. the MT may implement only one PDP type,
or, (c) using the 'Empty PDP type' (TS 24.008). (No PDP address or APN shall be sent in this case and only one
PDP context subscription record shall 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 3GPP TS 22.030 [19].
Defined Values
<GPRS_SC>: (GPRS Service Code) a digit string (value 99) which identifies a request to use the Packet Domain
service
<called_address>: a string that identifies the called party in the address space applicable to the PDP. For
communications software that does not support arbitrary characters in the dial string, a numeric equivalent may
be used. Also, the character comma ',' may be used as a substitute for the character period '.'.
<L2P>: a string which indicates the layer 2 protocol to be used (see +CGDATA command). For communications
software that does not support arbitrary characters in the dial string, the following numeric equivalents shall be
used:
0 NULL (Obsolete)
1 PPP
2 PAD (Obsolete)
3 X25 (Obsolete)