The ICM Main Window's Mute option can be used to temporarily turn off the ringing sound played when you receive an incoming call while on the Internet. Incoming Call Pop-ups 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 up ICM.
To enable or disable the Mute feature:
Click on the Mute box.
When this feature is enabled, the Mute box is green:
Note: You can permanently disable the ringing sound using the General Menu under the Setup button. For details, refer to Sound On.