This article describes how to confirm the functionality of the Cisco 8821 wireless phone microphone while investigating a one way or no way audio situation.
The Cisco 8821 wireless phone has configurable side tone that can be used to confirm the functionality of the microphone. Sidetone is sound received from the microphone being played out of the earpiece or headset port. This is done to mimic normal speech where a person's ear will hear what they are saying while speaking. This is useful for adjusting spoken volume levels.
To use the sidetone feature on the 8821 phone follow these steps:
Step 1. On the 8821 IP phone, navigate to Settings > Phone settings > Sounds> Headset sidetone.
Step 2. Set the value to High.
Step 3. Ensure the speaker phone is Off (no speaker icon next to the wireless signal indicator).
Note: This procedure can only be used in conjunction with the 8821 IP Phone earpiece. Speaker phone or the use of a headset is not supported.
Step 4. Place a call to or from the 8821 phone, answer it, and mute the phone that is not being tested for microphone functionality.
Step 5. Tap and/or scrape the area near the microphone on the 8821. The microphone is located on the bottom to the left of the charging plate. There is a small hole indicating the microphone location.
Step 6. Check if the tap sound can be heard from the phone's earpiece.
If sound can be heard on the earpiece during the test the microphone is functional. If no sound is heard the microphone is not functional.