Detection of dropped voice calls

Posted on by Admin

2 thoughts on “Detection of dropped voice calls”

  1. I need to be able to distinguish a remote hangup from a dropped call.

    I don’t have a convenient way of simulating a dropped call so I can’t experiment much.

     

    I turned on

    AT#DIALMODE=2

     

    so when the remote hangs up I get the unsolicited result code:

    DISCONNECTED

     

    Is there a different unsolicited result code if the call is dropped due to losing the signal?

    Is there a command that will allow the software to tell why a call was terminated. It appears that maybe

    AT+CEER

    might give the answer but the documentation does not state what the return report would be for a dropped call.

     

    Thanks,

     

    Alan 

    1. AT#CEER has a list of error codes in its description in AT Commands Reference Guide.

       

      Remote refusing the call (hang-up): DIALING/RINGING/BUSY; code 17 User busy.

       

      Detaching the antenna during call: DIALING/RINGING/CONNECTED/DISCONNECTED; NO CARRIER and code 255 Lower layer failure.