Terminate a dialed call in initiated/ringing state

Question

My intention is to limit outgoing calls to regional only. For eg, if the caller is from Canada, that person can only call in Canada numbers. I am basically, trying to separate US and Canada numbers. I have already blocked other countries incoming/outgoing calls.

To do this: When the dial verb is done, I have a statusCallBack at initiated state. From the Call details, I get the ToCountry and depening on that, I update the callStatus to Cancelled/Completed following twilio.com/docs/voice/tutorials/how-to-modify-calls-in-progress/node#

The call is made :

  const dial = twiml.dial({
        hangupOnStar: true,
        action: '/callResult',
        timeLimit: 300,
    });

    dial.number({
        statusCallbackEvent: 'initiated',
        statusCallback: '/checkToCountry'
    },numToCall);


CallBack func :

app.all('/checkToCountry', (req, res) => {
    const twiml = new VoiceResponse();
    console.log(req.body);
    console.log(req.body.ParentCallSid);
    console.log(req.body.CallSid);
    if(req.body.ToCountry != 'US')
    {
        console.log("Not Calling allowed country : " + req.body.ToCountry);
        client.calls(req.body.CallSid).update({status: 'canceled'}).then(call => console.log(call.to));
    }
    res.send(twiml.toString());
});

However, this doesn't seem to work. I am assuming this is because we can only do this when call is in-progress?

Is there a better way to do this ?