UAN provides a multi-application integration which is vendor independent and developed using industry standards in mind. All integration based business process for various industries has been complied and pre-packaged in UAN.

This eliminates worries of building and managing integration server because UAN has operating the process

Virtual business components (VBCs) are mechanisms in Siebel EAI by which data from an external system can be viewed in Siebel applications without having to replicate that data within the Siebel Database. We will discuss VBC in a series of 4 articles. Here is the first one, which will help you in understanding why we require VBC and what are VBC’s?.

The Siebel Enterprise Server is a logical grouping of Siebel Servers that supports a group of users accessing a common Siebel Database Server,Siebel Enterprise Server can be configured, managed, and monitored as a single logical group, allowing the Siebel administrator to start, stop, monitor, or set parameters for Siebel Servers within a Siebel Enterprise Server.

Siebel Call Center and customer support software helps sales, telesales, and customer service representatives to better understand and address the needs of their customers.
Siebel Call Center allows agents to handle service, support, and sales interactions across a broad range of communication channels such as telephone, email, fax, pager, wireless messaging, and voice over IP, Web collaboration, and chat. These channels are integrated, allowing each agent to become a customer-contact manager, supporting a range of products and services and presenting tailored offerings designed to meet customer’s needs.

A Web Service is programmable application logic that is accessible using standard Internet protocols. Web Services combine component-based development and the Internet and can be reused regardless of how the service is implemented. 
Web Services are based on communication protocols that include HTTP, XML, Simple Object Application Protocol (SOAP), and Web Services Description Language (WSDL).