c# - how detect caller id from phone line?

Question

Is it possible to read bytes directly from modem or phone line without losing any info? If use SerialPort after ringing nothing happens on ReceiveData event.

I want to read caller id info directly from the line. My modem doesn't support Caller Id.

Answer 1

The correct way to detect the caller ID is to use the TAPI API.

You can find a C# TAPI library (called ITAPI3) here. http://www.julmar.com/tapi/

Check the April 04, 2006 blog entry for some notes on building programs linked against it on 64-bit Windows.

And here's sample code:

TTAPI tapi = new TTAPI();

tapi.TE_CALLINFOCHANGE += (sender, e) =>
{
    if (e.Cause == CALLINFOCHANGE_CAUSE.CIC_CALLERID)
    {
        Console.WriteLine(e.Call.get_CallInfo(CALLINFO_STRING.CIS_CALLERIDNUMBER));
        Console.WriteLine(e.Call.get_CallInfo(CALLINFO_STRING.CIS_CALLERIDNAME));
    }
}

tapi.Initialize();

// ...
// Keep the TAPI object in memory so it can listen for events
// ...

tapi.ShutDown();