Sitecom CN-512 User Manual page 63

Now you are able to configure some special AT commands for the dial-up
connection. This AT commands are necessary for HSCSD and GPRS
connections. Basically the GPRS APN can also be preconfigured on the
mobile phone. If you are already able to establish a GPRS connection from
the mobile phone it isn't necessary to enter the APN again as AT
command. In that case just click 'Next' to proceed, else click 'Advanced
Modem Settings...' to configure your AT commands.
Enter your special AT commands. For GPRS and HSCSD there are two
examples in the image below which you can use via Copy + Paste and
then modify according to your provider.
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