COMMUNICATION MANAGEMENT DEVICE, COMMUNICATION MANAGEMENT METHOD, COMMUNICATION MANAGEMENT PROGRAM, AND COMMUNICATION MANAGEMENT SYSTEM

Incoming call controlling device, incoming call controlling system, and incoming call controlling method

Exchange, call facilitation method, and call facilitation program

Incoming-call number notification apparatus, exchange, incoming-call number notification system, and computer readable medium

Nurse call system, nurse call conversion unit, nurse call connection method, and program

Inter-main-apparatus interface device, main-apparatus system including same, and inter-main-apparatus interface method

Method and apparatus for enabling customer premises public branch exchange service feature processing

Telephone exchange system, dial-in incoming call method thereof, and dial-in incoming call program thereof

Telephone exchange system, communication apparatus, telephone incoming call method, and non-transitory computer readable medium storing program

Telephone relay device, method of relaying telephones, and program therefor

Method and apparatus for enabling customer premise public branch exchange service feature processing

Method and apparatus for enabling customer premise public branch exchange service feature processing

Method and apparatus for enabling customer premise public branch exchange service feature processing

Electronic loop provisioning

Broadband communications