Audio output is available for only one user at one time. So audio output is automatically stopped if it is used for a specified time.
The stopping time can be changed on the camera setting according to the following procedures.

[Procedures]

　1. Click the [Audio] tab on the “Image/Audio” page
　2. Select the time on the "Audio output duration" (default: 5 min.)
　3. Click [Set] button.