Call forwarding (or call diversion), in telephony, is a feature on some telephone networks allowing an incoming call to a called party to be redirected to a third party. For example, the third party may be a mobile telephone, voicemail box or other telephone number where the desired called party is situated. It was invented by Ernest J. Bonanno. In North America, the forwarded line usually (though not always) rings once to remind the customer using Call forwarding that the call is being redirected. More consistently, the forwarded line indicates its condition by stutter dial tone. Call Forwarding lets you forward incoming calls to your home number to another telephone number. The number can be anywhere in the U.S., though you will pay any long distance charges for forwarded calls outside your local calling area. To activate Call Forwarding, dial #72 followed by the telephone number to forward calls to. Once someone answers, Call Forwarding is in effect. If no one answers or the line is busy, hang up and dial #72 followed by the same telephone number, and Call Forwarding will then be in effect. To turn off Call Forwarding, dial #73. This feature requires a subscription from your local telephone company. Also available in some areas is Remote Access to Call Forwarding, which lets you turn Call Forwarding on and off from telephones other than your home phone.

Rufumleitung (englisch: Call Deflection (CD)) ist ein Leistungsmerkmal der Vermittlungstechnik und von Telefonanlagen. Es handelt sich dabei um eine sofortige Umleitung eines ankommenden Telefongespräches (Anruf). Es unterscheidet sich von den anderen Anrufweiterschaltungen, da hierbei die Weiterleitung ausschließlich fallweise (per Anruf) eingeleitet wird, und nicht konfiguriert zu einem Ziel, wie es nur bei den sogenannten Call-Forwarding Diensten möglich ist. Rufumleitung und Call-Forwarding Dienstmerkmale werden unter dem Oberbegriff Anrufweiterschaltung (englisch: Call Diversion) zusammengefasst.