12If busy, forward to telephone number**13Cancel call forwarding if busy*14 + destinationCall forwarding if unavailable**14Cancel call forwarding if unavailable1.12. CallbackThe Completion of Calls on No Reply (CCNR) creates a callback in case a person cannot be reached(e.g. the person is not on its desk or busy) at the moment.To use this function, the CCNR function has to be enabled in the administration portaland in the phone extension. Click on the CCNR check box under Administration / Profileto activate the function.Activate a callbackA caller generates automatic connection establishment within the private branch exchange (PBX) toa previously busy party (only internally). If the the other party cannot be reached, the caller can usethe callback function.-In order to activate the function, insert *5 into your key pad. An accoustic confirmation will finalizethe activation.-As soon as the other party is available again, your end device receives a callback generated by thePBX. As soon as you answer the callback, the PBX sends out a call to the number you tried to reachinitially.Erase Callbacks- If the callback is no longer needed, all call backs can be erased by entering the **5 code into thekey pad. An acoustic confirmation finalises the erase.2. Advanced telephone features2.1. Overview