With the feature group pick-up, the user can subscribe to a group pick-up service, and it will receive call notifications for all users in this pick-up group.
Open the web-interface of the N870 and go to: Settings - Mobile devices - Administration and select an handset.
Enter the number of the pick-up group.
On the handset you hear the notification tone and see the following message.
With the Left Soft key you can ignore the message.
With the Right Soft key you can Pickup the Call.