Communication on hold

Communication on hold notifier

Communication server apparatus and method

Communication server apparatus and method

Communication server apparatus and method

Communication server apparatus and method

Communication server apparatus having distributed switching and

Communication server apparatus having distributed switching...

Communication server apparatus having four-wire switching interf

Communication server apparatus using digital signal switching an

Communication server apparatus using frequency multiplexing and

Communication server apparatus using frequency multiplexing...

Communication system and communication channel coupling method

Communication system between local area network stations

Communication system capable of displaying addresser...

Communication system having a changeable calling mode and termin

Communication system having a first and second communication pro

Communication system having the capability of selecting an...

Communication system having voice and data capability

Communication system, method and device for remotely re-transmit