Currently Call Recording applies only to calls to/from phone numbers and calls to your PBX extension only. Direct Calls to/from the app are not included in recorded calls.
Record all calls will enable recording of all the incoming and outgoing calls.
Record internal incoming calls enables recording only of internal incoming calls.
Record internal outgoing calls enables recording only of internal outgoing calls.
Record external incoming calls enables recording only of external incoming calls.
Record external outgoing calls enables recording only of external outgoing calls.
Record by pressing a key sequence *9 will allow you to start recording calls by pressing *9 on dialpad.