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Your GSM SIM Card subscription must be configured by your network operator to include "Circuit Switched Data" services (CSD). The specific type of data service required is very similar to that of a fax call i.e. as if the mobile phone were to send & receive faxes.
The detailed requirements are:
"Bearer 26" with following options:
Non-transparent mode, V110 and V.32 intermediate rate, UDI (Unrestricted Digital Information) with data compression disallowed.
With some operators, a secondary "data telephone number" (MSISDN) maybe provided to facilitate this data service.
This capability must be activated for all roaming conditions.
Note that "Circuit Switched Data" is different, and often confused with GPRS data services (also known as "Packet Switched Data" services or "PSD"). The existence or absence of GPRS services has no effect on SecureGSM Secure Calls.
The above should be sufficient detail for network operator to understand how to configure the account for SecureGSM Secure Calls.
Note: While at the MSC (Mobile Switch Centre), it is possible to use a modem to convert to an "analogue" signal, which will typically be encoded and sent from the MSC as a digital PCM signal, this should not be done.
It is important to directly use the digital signal as an ISDN data signal and feed it into the equivalent of a remote access server and NOT TO CONVERT THE DIGITAL SIGNAL INTO ANALOGUE.
IT IS A REQUIREMENT THAT CSD DATA IS NOT CONVERTED TO ANALOGUE SIGNAL AT ANY GIVEN TIME BY THE SERVICE PROVIDER.
Failure to follow this requirement will prevent SecureGSM software from normal operation.
Note: The CSD service must be provisioned on all SIM cards for SecureGSM™ SP to function.
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