is it possible to have ongoing voice call and use GPRS (make connections, send data, etc) at the same time? I have done some testing and it seems that when there is an voice call in progress any connection attempt with AT#SD ends up with +CME ERROR: 559 and is working again after the voice call ends.
Telit GPRS modules are mobile station class B, can be connected to both voice and GPRS services but use only one at a time.
Cosmin, what about if device is in GPRS connected state (UDP) and incoming or outgoing voice call? I have device that is working in this conditions. GPRS is activated first.
The GPRS activation is maintained but the traffic will stop during voice calls and will resume after.
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