Technical support

Fault Finding Guide

Work through a few focused questions to identify the likely cause and find the relevant technical guidance.

Choose the closest answerHandset microphone failed

500 Series Audio One phone Low hum on speech to door Handset microphone failed

Recommended guidance500 Series

What to check

A low Hum on speech to the door from one phone only can be the microphone failing in the handset, try swapping the handset with another to test.

Replace handset.

ID13533