When NCR is used, the UUI is forwarded by the Avaya Communication Manager in the SIP REFER or 302 Moved Temporarily messages.

The UUI is forwarded by the Avaya Communication Manager in a SIP REFER message if the call has been answered. A call can be answered for example, if an agent answers the call, a vector plays an announcement or music, or the call is processed by a command that provides an answer such as collect digits. The REFER is sent back to the caller, causing the first call to be dropped after a second call is issued and established with the next location.

The UUI is forwarded by the Avaya Communication Manager in a 302 Temporarily Moved message if NCR is invoked before the call is answered. The first call is redirected to the next location.