The Message Transmission Optimization Mechanism (MTOM) feature provides optimization of binary message transportation using XOP (XML-binary Optimized Packaging). If attachments are enabled for the web service descriptor, instances of XML-type base64Binary are transported using MIME attachments, which improves the performance of large binary payload transport. Integration Server supports SOAP attachments only for web service descriptors that specify style/use of RPC/Literal or Document/Literal.

Integration Server supports streaming the SOAP attachments based on the MTOM/XOP standards for both inbound and outbound messages. For more information about the configuration required to enable MTOM streaming, see the Web Services Developer’s Guide.