The ICM Main Window's Mute button can be used to temporarily turn off the ringing sound played when you receive an incoming call while on the Internet. Incoming Call Pop-up Windows will still be displayed with this feature enabled.
When enabled, this feature remains in effect until you disable it or until the next time you start ICM.
To enable or disable the Mute feature:
Click on the Mute box.
When this feature is enabled, the Mute box has a checkmark in it:
Note: You can permanently disable the ringing sound using the General Menu in the ICM Setup window. For details, refer to Specifying General Options.