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During active call session when hanging up the active call though AT Command "ATH". We are getting the response "Ok" but after that, other AT Commands not get any responses. Like AT+CSQ, AT+CREG, AT+SMONI, or for simple "AT" COmm

sumo

August 10, 2020 - 8:59am, 149 views

Hello All,

we are facing issue in the GSM Modem side during voice calls, below are our observations.

Issue: - During active call session when hanging up the active call though AT Command "ATH".
             We are getting the response "Ok" but after that, other AT Commands not get any responses.
             Like AT+CSQ, AT+CREG, AT+SMONI, or for simple "AT" COmmand also not receiving any responses.
A. Observation 1 :
      1. GPRS session(Packet Transmission and reception)  was not active after the GSM power-on.
      2. Voice Call Session(Incoming call received /outgoing call dialed ) started and call status is " ACTIVE ".
      3. And requested for the Call hang up the session through "ATH" Command.
      4. "ATH" Command receive "OK" Response
      5. All other AT Commands also execute properly with the expected response.
B. Observation 2:
Test Log files :
      1. GPRS Session was active after the power-on (Able to see the packet transmission and reception ) .
      2. Voice Call Session(Incoming call received /outgoing call dialed ) started and call status is " ACTIVE ".
      3. And requested for the active call hang up the session through "ATH" Command
      4. "ATH" Command receive "OK" Response
      5. But after this, other AT Commands do not get any response.
GSM BGS5 Module Details :
  • Manufacturer: Cinterion
  • Device MOdule: BGS5
  • Firmware Version: REVISION 01.100
  • Application Revision Number:  A-REVISION 00.001.36
Please help.
Thanks