Multi-Tech Systems GPRS (MTMMC-G) Benutzerhandbuch

Chapter 15 – GPRS Commands  

Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 

162 

 

Description: 

This command causes the modem to perform whatever actions are necessary to establish 
communication between the DTE and the external PDN.  

 

The V.25ter 'D' (Dial) command causes the modem to enter the V.25ter online data state and, with the 
DTE, to start the specified layer 2 protocol. The modem 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 described briefly in clause 9, for 
IP, of GSM 07.60. 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. 

 

If <cid> is supported, its usage is the same as in the +CGDATA command. The +CGDCONT, 
+CGQREQ, etc. commands may then be used in the modem initialization AT command string to set 
values for for PDP type, APN, QoS etc. 

 

If <cid> is not supported or is supported but omitted, the modem attempt to activate the context using 
the 'Empty PDP type' (GSM 04.08). (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.) 

 

Note: If a GPRS PPP session is already running, the setting of a CSD (GSM data call) is not supported. 

Values: 

(GPRS Service Code for IP) a digit string (value 99), which identifies a request to 

use the GPRS with IP (PDP types IP and PPP)  

<cid>  

A digit string which specifies a particular PDP context definition. 

Command 

D*<GPRS_SC_IP>[***<cid>]#

CONNECT
ERROR 

ATD*99***1#

 CONNECT 
 ATD*99***2# 
 ERROR