Audio Level; Audio Quality; No Audio Between Units - Cisco 8831 Administration Manual

Audio and display problems
• The wired or wireless microphones are not on a flat and stable surface.
• In Linked Mode, the primary and secondary sound base units are too close together.
Solution
Check the placement of the bases and microphones.

Audio level

Problem
A user complains that the audio level is too low.
Cause
You may be experiencing one of the following:
• The user is not facing the conference phone when speaking.
• The user is too far from the conference phone when speaking.
• The wireless microphones are being moved.
Solution
Consider using external microphones, or increasing the room coverage by using Linked Mode.

Audio quality

Problem
User complains about poor audio quality.
Cause
You are using a narrow band rather than a wide band codec.
Solution
Verify on the CUCM that the default codec is G.722 (wide band).

No audio between units

Problem
There is no audio to or from the secondary unit in Linked Mode.
Cause
The daisy cable is not connected properly.
Cisco Unified IP Conference Phone 8831 Administration Guide for Cisco Unified Communications Manager
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Troubleshooting and maintenance