If the visitor cannot hear the person inside, the microphone path may be failing at the indoor station, outdoor panel, wiring or system board. First confirm the direction of the problem. Can the occupant hear the visitor? Can the visitor hear the occupant? One-way audio and no audio are different problems.

Check whether the issue affects one apartment, one indoor station, or the whole building. A single unit problem may involve that station or its wiring. A building-wide problem may involve the panel, amplifier, power supply or shared equipment. If the system has recently been upgraded or reset, account and configuration details may also matter.

Outdoor conditions can affect audio. Dirt, water, paint, damaged grille openings or a loose panel can interfere with a microphone or speaker. Do not spray cleaner into the panel. Take clear photos of the speaker and microphone area, and note whether the issue happens all the time or only during rain, cold weather or busy building hours.

Call for inspection when one-way audio continues after basic checks. Send the property type, ZIP code, panel photos and a short description such as "inside hears visitor, visitor cannot hear inside." A precise description helps 770 Doors & Windows focus the visit on the right part of the intercom system.