Mini-MT User Guide
Revision 1.02
GSM2228UG001 Page 34
If AT$NETIP returns all zeros, send the following command:
AT$CGEER<CR>
There are three common responses:
$CGEER: no PDP reject cause
(Everything should be working properly)
$CGEER: requested service option not subscribed
(APN is incorrect or SIM has not been enabled for data mode.)
$CGEER: user authentication failed
(username and/or password is incorrect.)
To configure the modem for server interoperability, several things have to be addressed:
• Most GPRS configurations are Mobile Originate only. The mobile modem must
initiate a conversation with a remote server before the remote server can talk to
the modem.
• IP addresses are dynamically assigned and can change.
• Some IP addresses are NAT and are non-routable.
These issues are addressed with the following configuration commands.
The examples will use the following information:
• Modem ID/name = “MMT_Test”
• Remote Server IP address = apitest.enfora.com
• Remote Server IP port = 1721
Give the modem a unique name with the following command:
AT$MDMID=”MMT_Test”
NOTE: This command, combined with the wakeup message, will allow the server
to associate a Public IP address with a specific modem and create a window of
opportunity where the server can send commands to the modem.