I'm trying to do a C# code that call, through a 56k modem, a real phone number. The Call works correctly but now I need to know if the person I call answer to the phone or not (it is for an alarm project).
To do my call, I use AT commands. With a command like that :
I can process my call and it works good. But after that I have no feedback. And I need to know what's happened.
When I have searched in Google, I found na AT Command :
that supposed to list the current call.. http://www.g1sat.com/files/HNS_9201_AT_Reference.htm#AT_plusCLCC
But for me it doesn't work.. The return is always ERROR.
If someone has an idea thanks for your help.
For Info my 56k modem is an 3Com U.S. Robotics, and my c# code use the ActiveComport Serial Port Toolkit.