Goal :

I am trying to develop a C++ application that uses TAPI (Telephony Application Programming Interface) to control calls on an Avaya IP Office system. My goal is to route incoming calls to specific extensions programmatically in real time using TAPI.

What I Want to Achieve:

1. Initialize a TAPI connection to Avaya IP Office.
2. Monitor and handle incoming call events like call offering.
3. Route incoming calls to specific extensions based on predefined logic.

What I Have Tried So Far:

1. I have installed the required Avaya drivers for TAPI and configured the system.
2. Included the tapi.h header file and linked Tapi32.lib in my C++ project.
3. Attempted to initialize TAPI using lineInitializeEx and monitor calls using lineOpen, but I am running into issues such as undeclared identifiers for TAPI constants and functions.

Questions:

1. How do I configure and initialize TAPI properly to communicate with Avaya IP Office?
2. How do I programmatically route incoming calls to extensions in real time using TAPI?

Code That I Am Trying So Far:

#include <windows.h>
#include <tapi.h>

int main() {
    HLINEAPP hLineApp;
    LINEINITIALIZEEXPARAMS lineInitExParams = {0};
    lineInitExParams.dwTotalSize = sizeof(LINEINITIALIZEEXPARAMS);
    lineInitExParams.dwOptions = LINEINITIALIZEEXOPTION_USEEVENT;

    DWORD dwNumDevs = 0;
    LONG lResult = lineInitializeEx(&hLineApp, NULL, NULL, "TAPI App", &dwNumDevs, NULL, &lineInitExParams);

    if (lResult == 0) {
        // Successfully initialized
        lineShutdown(hLineApp);
    } else {
        // Handle error
    }
    return 0;
}

I would greatly appreciate a step-by-step guide or any resources to help set up and configure TAPI for routing calls on Avaya IP Office.

Thank you in advance!