Overview

The system is built on a modular design to provide scale out support when the limits of a single server are reached or specific environmental factors require different roles within the system to be performed by different servers . As roles can be performed by different servers each of them belongs to the same site and is managed through a single interface giving the user a single point to view the entire system.

Within each site there are several key roles that need to be performed. The roles need to be assigned to a specific server and a server can host multiple roles.

• WCF Server: This is a required role for each server and provides core service processes.
• Database: This role is for the server that hosts the Microsoft SQL Server database. There can only be a single server with this role.
• Licensing: This role performs the license management and activation process for site. There can only be a single server with this role.
• Website: This role is for servers that will host the website. There can be multiple servers with this role.
• Communications Gateway: This role provides integration services for client applications.
• Recording: This role is for servers that will record calls. There can be multiple servers with this role.
• Business Intelligence: This role generate business intelligence information, including call categorization.

A site may need to be scaled out for several reasons:

1. The number of devices to record exceeds the capacity of a single server.
2. The devices to record are physically located beyond the reach of where a tap can be connected, for example when recording PRI lines the maximum length of the cable required to tap the lines is 10 meters.
3. The management website needs to be accessed via the Internet and needs to be installed into a DMZ environment.
4. The customer wishes to use a different SQL Database server.

For each server within a site the Site Settings applies to all servers with this site. If a server is required to have different Site Settings then the server will need to be moved to a different site. Multiple sites can be linked together, see the relevant section for a list of cross site supported features.