Use of routing area (RA) and class of service (COS) definitions are optional. Both parameters are used in the call routing process, along with the dialed digits, and both are defined under Administration on the Telephony Control Server Assistant navigation bar. Routing areas are sometimes referred to as rate areas, a term commonly used in the public network.
Each subscriber endpoint can be assigned a class of service and routing area. The routing area is normally used to indicate the physical location of the endpoint, especially within installations where Lotus Sametime Unified Telephony subscribers are located at multiple geographic sites.
Class of service can be used to indicate the endpoint device type—for example, a fax-only device, an emergency phone, or a terminate-only device—or to indicate the department, priority, or importance of the caller.
By using these two values, it is possible to create location-specific (source-based) routing configurations, department-specific, and/or prioritized call routing arrangements within a single Lotus Sametime Unified Telephony switch.
Routing areas and classes of service are just user-defined readable category names which can be used in the routing process. The string name is only used for ease of administration and viewing. Caller class of service and routing area, along with the translated digits, are three parameters taken into account during the call routing, destination, and gateway selection process.
Figure 1. General tab - Subscriber dialog
Parent topic: Routing and Translation