# Call deflection overview

Call deflection services allow calls presented to the served user to be rerouted to a different address. Call deflection is only applicable to user/network type interfaces such as ETS 300, and not to peer-to-peer interfaces such as Q.SIG.

An ETS 300 served user application can use the call deflection service in either of two ways:

- It can activate the call deflection service. When activated, call deflection takes place in the stack. From then until the service is deactivated, all calls on a specific NAI
  destined for the served user are rerouted to another user.

- It can invoke the call deflection service on a call-by-call basis.

Regardless of which service is used, the diverted-to user is always notified of a forwarded call using a notify diversion operation.