Solution:Determining Inbound or outbound web service is very easy.
If the salesforce exposes SOAP or REST web service and any external system consume it to get required data from salesforce, then it is Inbound call to Salesforce.
If the salesforce consumes any external system web service to get required data to salesforce, then its Outbound Call to Salesforce.
In the Inbound Web service, Salesforce will be the publisher and external system will be consumer of web service and in Outbound web service its reverse i.e salesforce will be consumer and external system will be the publisher of web service.
If the salesforce exposes SOAP or REST web service and any external system consume it to get required data from salesforce, then it is Inbound call to Salesforce.
If the salesforce consumes any external system web service to get required data to salesforce, then its Outbound Call to Salesforce.
In the Inbound Web service, Salesforce will be the publisher and external system will be consumer of web service and in Outbound web service its reverse i.e salesforce will be consumer and external system will be the publisher of web service.
