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.