取り次ぐ

to pass on (a message, thoughts, etc.); to convey; to transmit; to relay; to tell

to inform (of a visitor, phone call, etc.); to announce (a visitor); to answer (the door or phone on someone's behalf); to usher in (a guest)

to act as an agent (between a manufacturer, wholesaler, etc. and retailers); to act as an intermediary; to handle (goods; for a company)