Abstract: A method of silent monitoring in a telephone system by a monitor comprising storing in a first table in a memory, correspondence between an agent identifier and a telephone set directory number used by the agent, requesting silent monitoring of the agent using the identifier, checking the table to determine the directory number of the telephone set corresponding to the agent, creating and storing a record containing the directory number, an identifier of the monitor and the agent identifier, in the event a telephone call is in process using the telephone set, conferencing a telephone set used by the monitor with the telephone set used by the agent, using a one way audio path toward the telephone set used by the monitor, in the event the telephone call in process clears, maintaining the record until the telephone set used by the monitor has gone on-hook, and continuing to monitor subsequent calls involving the telephone set used by the agent prior to the telephone set used by the monitor going on-hook, maintai