If call deflection is activated for all calls on an NAI, the application receives a notification when a call is deflected through the ACU_MGMT_SAPI. The stack returns an ACU indication message to the application containing an acu_ss_deflect_ret_result extended data structure.
The following illustration shows the exchange of messages that takes place when call deflection is activated for an NAI. In this scenario, user A is calling user B, and user B (for example, PBX) deflects the call to user C.