Connection is established when called party answers. If you try placing a call back to a busy extension and hear a fast busy signal, a call back may have already been placed against the busy station, or you may already have placed a call back against another extension. The system allows only one call back to be activated by or placed against an extension at any one time. Call back is automatically canceled if the telephone that set the call back doesn't answer after approximately three rings. To Cancel Lift handset.
Call is placed on hold.
Only one call can be parked at a time. To retrieve parked call from remote telephone Lift handset. To retrieve parked call from originating telephone Lift handset. Your voice is heard through called party's Dterm speaker. Press the MUTE button again to restore two-way conversation.