Detection of dropped voice calls

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.