If would like start from the basics of Web Services then I will suggest going through these articles first and also basic tutorial of creating an outbound web service.
A lot of people have asked me to put light on implementing Secure Web Services but due to time constraint I haven’t been able to do that. [...]

Here is an article by Babu Rajendra Prasad Mungara a reader of Siebel Unleashed describing basic details of implementing a Secure Outbound Web Service is Siebel. Though it does not provide implementation steps in detail but it outlines the steps that you need to perform to accomplish that. 

 All right now let’s get on to the different problems and their solutions that I faced while working on this Outbound Web Service. Most of the problems that I faced were when I tried to use workflows.
 Error:
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Argument ‘SiebelMessage’ in step ‘Set Child Type’ is not correctly initialized or does not return valid data.(SBL-BPR-00107)
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Well as I said I my last post that I am going to give a try to one more approach on invoking web service and will try to make this solution Scriptless. I did try, but unfortunately I was not successful.
 I tried a lot of things such as using a different container XML element, Data [...]

We successfully created Web Service record in previous post and in this post we will do the following:

Create a button on Contact Form Applet with caption as “Lookup” and method name as “LookupCountry”.
Create two new fields “IP Address” and “IP Country” on Contact BC
Expose these two fields on Contact Form Applet
When we click on Lookup [...]

According to me this is the most comprehensive tutorial you can find on net about creating Siebel Outbound Web Service. You can use resources mentioned in this article and use this example to create variety of Outbound Web Services in Siebel.
This tutorial assumes that you are familiar with basics terminology and concepts of web service.  [...]

I was fortunate enough early in my carrer to get a chance to work on Siebel EAI. It was the first implementation of Web Services in our project. So, had to struggle a lot to understand basics of web service. But I always from my school time had intrest in XML and Web so understanding [...]

This is an age of Digitization and Communication. We want to make every aspect our life as easy as we can.We are trying to digitize every business process that we know such as marketing, sales. Internet is playing a pivotal role in making world a global village. We can reach anyone, anytime, anywhere. It is [...]