Disable/Enable Automatic Gain Control

Use the following procedure to turn automatic gain control for the handset, headset, and/or the Speaker on or off.

1. While the telephone is on-hook and idle, press the following sequence of keys on the faceplate of the telephone:

Mute 2 4 2 # (Mute A G C #)

NOTE: Press the Mute button momentarily. Do not press this button while pressing other keys/buttons. The 4630/4630SW IP Telephones and the 4690 IP Conference Telephone do not have a dedicated Hold button. For all other 4600 Series IP Telephones, pressing the Hold button instead of the Mute button also works.

2. After entry of the command sequence, all telephones except the 4601 display the following, based on the current value of the system value AGCHAND:

3. To change the AGC Handset value from On to Off, press 0. To change the AGC Handset value from Off to On, press 1.

If the telephone has a Headset interface one of the following displays, based on the current value of the system value AGCHEAD:

If the telephone does not have a headset interface, proceed to Step 5.

4. To change the AGC Headset value from On to Off, press 0. To change the AGC Headset value from Off to On, press 1.

One of the following displays, based on the current value of the system value AGCSPKR:

5. To change the AGC Speaker value from On to Off, press 0. To change the AGC Speaker value from Off to On, press 1.

If a value different from the current AGCHAND value and/or the current AGCHEAD value and/or the current AGCSPKR value is entered, all telephones except the 4601 display the following text left-justified at the top of the display:

6. Press the * button to terminate the procedure, or the # button to save the new value(s). If you press the # button, all telephones except the 4601 display the following text:

The telephone saves the new value(s).