Handle a transaction between OSB and SOA suite

Recently looked at how to handle a transaction between OSB and SOA suite. From all of document I found, the HTTP protocol can not support transaction however you set your service. If we want them to support transaction, we have to use direct binding.
In composite, we need to modify the reference to set <binding.direct> .
For SOA-OSB, we should set the transport protocol to sb protocol of proxy service.
For OSB-SOA, we should set the transport protocol to soa-direct of business service.

For the features of SOA-Direct, see OSB-SOA Direct transport

For how to implement a global transaction, we can refer to Edwin blog.
Global Transactions and Quality of Service in OSB

References
http://docs.oracle.com/cd/E14571_01/integration.1111/e10224/invocapi.htm#SOASE85537
http://docs.oracle.com/cd/E14571_01/doc.1111/e15866/soa.htm
http://biemond.blogspot.ca/2010/11/global-transactions-and-quality-of.html