Pybind callback function generation

[maneeshsinghxavo]

I am writing Python binding code for a C++ function:

void APIExtProvider::acceptCall(My::namespace::Reply reply)
{
    std::cout <<__FUNCTION__ << std::endl;
    reply(My::namespace::Result::Ok, nullptr);
}
using Reply = std::function<void(Result result, std::exception_ptr error)>;
enum class Result {Ok,NOT_OK }

bind code:

py::class_<APIExtProvider>(m, "APIExtProvider")
    .def("acceptCall", &APIExtProvider::acceptCall, py::call_guard<py::gil_scoped_release>())

python_call:

result = pyunifiedphone.Result.OK
exception = pyunifiedphone.Exception()

def reply_method(result, exception):
       print(f'result : {result} + "exception {exception}')

     
 provider.acceptCall(reply_method)

However, I get this error:

TypeError: acceptCall(): incompatible function arguments. The following argument types are supported:
1. (self: pyunifiedphone.APIExtProvider, arg1: Callable[[pyunifiedphone.Result, pyunifiedphone.Exception], None]) -> None

Invoked with: <pyunifiedphone.APIExtProvider object at 0x7f2b6aa149b0>, , <function reply_method at 0x7f2b6abfa1f0>

What is the correct way of binding?

any suggestions?