Gsm Units With Tcp/Udp/Ip Stacks - Sony Ericsson GPRS and TCP-IP with the SEM GSM modules Application Note

Using GPRS and TCP/IP stack with SEM GSM modules
2. Install the modem onto the PC using the latest modem driver that can
be downloaded from the internet.
3. Set up a dial up networking session using the modem that you have
just installed. Make sure that all parameters in both the dial up
networking session and the modem properties are set to 9600bps.
4. Start to make the call using the dial string *99***1#, the unit should
now negotiate an IP address with the server and enable the PC to surf
the web.
Note : You may need to adjust some of your Internet explorer settings
to allow it to accept data from the dial up network connection.
If the connection fails the most common errors are :-
Error 738 – The most common cause of this error is that the SIM does not
have access rights to the internet DHCP server and it is unable to allocate
the unit an IP address.
Error 692 – This is generally attributed to either the modem not being on
or the PC talking at a different baud rate to that which the modem is
talking at.

3.2 GSM units with TCP/UDP/IP stacks

The GSM units that have TCP/UDP/IP stacks on them allow the
application to forget about how the communication takes places and
allows transparent communication between the unit and the IP address
which the users web server is sat on i.e. data will be passed to the MS it
will then packet it up and the user will see it arrive at the port of the IP
address that has been connected to.
The AT command operation of the TCP/IP stack is specified in Application
note LZT 123 7631 R1A.
LZT 123 7699 R1A 8