In the sense of adjunct routing, routing is a capability for selecting an appropriate path for a call. When a routing application is started, it sends route registration requests, which contain a device ID, to Communication Manager. Routing requests instruct Communication Manager to send all incoming calls to these device IDs (in the TSAPI Service). The TSAPI Service sends the call to the application for routing. Communication Manager does not route these calls. Also referred to as adjunct routing.

In terms of access privileges (Allow Routing on Listed Device), routing refers to the ability to register with Communication Manager to route calls (as in adjunct routing). A CT User (or an application) can perform routing for a device or a device group. Routing privileges can be granted only by administering access privileges (Allow Routing on Listed Device).