2N Analogue GSM gateway 2N EasyGate PRO - Manual, 1749 v1.03 - Manual (Page 58)

Data connection using USB port 4.4
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GPRS connection (for GSM version) or EDGE, WCDMA and HSDPA connection can’t be
used for direct connection of two devices. It is dedicated for connection to APN,
usually to internet. Most mobile providers charge the connection according according
to the volume of data transmitted or by a lump sum and so the GPRS is suitable for
long-time connection.
SMS Sending and Receiving
It is possible to send and receive SMS units using appropriate AT commands. There
are a number of PC programs that are based on this principle. For GSM version install
SW supporting Cinterion modules (Siemens mobile telephone SW can also be used),
for UMTS version install SW supporting modules Simcom. You can send and receive
SMS even during EasyGate voice calls.
Combination of serial connction with Voice Calls
As already mentioned, SMS transmission can be made even during telephone calls.
The SMS program is only blocked temporarily during outgoing call establishing and
incoming call ringing.
The same applies to PCManager monitoring. A message announcing that EasyGate is
blocked is displayed during voice call establishing.
No voice call can be made during CSD data connection.
Outgoing and incoming calls can be made during GPRS connection. The GPRS
connection remains active during the whole call but no data can be transmitted
(EasyGate is a GPRS terminal of class B). Once the call is terminated, data
transmission is recovered immediately. Data connections Edge, WCDMA and HSPA on
UMTS version of Easy Gate can be active concurrently with the voice call.