How to Call External RESTFul service from Siebel in IP 16.

With IP 16, we can send REST request from external client to Siebel but what about calling external REST service from Siebel?

Do we have any Outbound REST service (JSON) examples like, sending the Siebel Information to External RESTful service in JSON format and Process the External Service reply(JSON) to Siebel update.

Example: When New Contact is created/Updated in Siebel, Send the contact details to external REST service and receive the response and process it in siebel.

I have gone through the blogs,REST API bookshelf, but I didn't find a way to Pass the Siebel data as JSON and invoke external REST service.