Each one-X Portal user, including you, has an active profile that includes a Call Pickup setting. When this setting is enabled, other one-X Portal users can answer your calls when they see that you have a call waiting to be answered. Note that this is not applied to all calls waiting to be answered, for example it is not used for hunt group calls.
When a user has enabled call pickup, the 
icon normally used to indicate they are ringing is also accompanied by their name being shown on a red background.
To pickup a call:
1. A red background indicates that the contact has a call or calls waiting to be answered and has call pickup enabled.
2. Click on the user's name to display information about the waiting call or calls.
3. To pickup a call, click on the number.