http URL Forwarding Setup
Login in your Account Portal. Click on Phone Numbers. Select the number you want to configure to set up call forwarding.
List of Phone Numbers
Click on any number and select "Edit Configuration" to go to configuration screen.
Click on HTTP.
Call Forwarding to Webhook
Type the the URL for you web application and click on Save.
You will see the number configured to http URL. This is a real time change, now all the calls will be forwarded to the URL for getting the instructions. Visit this page to Build the Voice Application.
Phone Number Configured for Webhook.

Troubleshooting Phone Call and HTTP URL responses

You can see the request sent to your web application and the response we received in the reporting.
Click on Reporting -> CDR, find the call that you want to troubleshoot.
There are two legs. Click on the date of the first leg which shows the number dialed.
Here you can see, we called webhook,
Call Response for Webhook Call
This call played the simple instruction and forward the call to another number.