@Deepika Jain An inbound call is a webs-service call which a ServiceNow instance receives from a third party system. An outbound call is a web-service call which the ServiceNow system makes to access data on a third party system with the help of an API.

In order to provide higher degree of data security ServiceNow only allows MID server to initiate any communication with ServiceNow instance hence only outbound calls are supported from MID server to ServiceNow instance. For more information please refer to https://docs.servicenow.com/en-US/bundle/rome-servicenow-platform/page/product/mid-server/concept/mi...