To debug a call, please
Get the call_UUID from dashboard logs (https://manage.plivo.com/logs/calls/) or using API(https://www.plivo.com/docs/api/call/#get-all-call-details)
Navigate to https://manage.plivo.com/logs/debug/?type=all
Key in the call_UUID in the search field, you will get the details of the call as shown below
You could check the XML document which is used on the call to handle the call flow which will help you debug the call from your end as well.