Of the private branch exchange co - Rufuowa - de equipment

摘要

PURPOSE:To attain an incoming call subjected to call forward without giving incoming to a caller when the final call forward destination is the caller himself by detecting the call forward state of a telephone set being a destination. CONSTITUTION:When an extension EKT1a makes a call to an extension EKT 1b subjected to call forward, an extension EKT 1n subjected to final call forward is cheked. If the final call forward destination EKT 1n calls the extension EKT 1a, a ring back tone is sent to the extension EKT 1a and a call tone is sent to the extension EKT 1x being the final call forward subjected to call forward. Thus, the caller can be subjected to the incoming to the extension subjected to call forward.