Dialog flow in IVR using Universal bot


We are using a Universal bot with 7 child bots and have configured the UB on IVR channel. When we test the UB on the developer console the desired child bot is being invoked and once the CB is done with the intent the control is passed back the UB and we are able to invoke a different CB for a different intent. But when using the IVR channel once the child bot is invoked the call just gets dropped once the child bot is done with the intent. I am unable to find a way to pass the control back to the Universal bot so that other child bots can be invoked for other intents. Version of kore is 8.1