# Activating call deflection for all calls on an NAI

Activation of the call deflection service has only local significance (for example, no signaling information is exchanged with the remote peer). It applies only to activation/deactivation on an NAI
basis for all served users.

To activate call deflection for an NAI, the application sends an ACU request message to the stack to the ACU_MGMT_SAPI containing an acu_ss_activate_deflect_invoke extended data structure.

## Successful call deflection activation

If call deflection is successfully activated, the stack returns an ACU indication message to the application containing an acu_ss_activate_deflect_ret_result extended data structure.

Activation of call deflection

## Unsuccessful call deflection activation

If call deflection is not successfully activated, the stack returns an ACU indication message to the application containing an acu_ss_reject extended data structure.