Every Jio customer is Having unlimited local and national calls for free. But it is of no use now as incumbent Operators are not providing enough POI to complete the calls and it results "all routes are busy" response.
Now we have found solution to make calls with an auto redial application. Which tries automatically until the call gets connected.
Download and install app from play store
Set auto redial time interval
Enter phone number
Click green dial Button.
That is it.
App connects call and when it says line busy just disconnect the call then app will automatically redials and repeat it until the call gets connected.