8.2.2.1. General Information 
Users in a node are combined into a local pickup group so that they
can take over incoming calls for one another. Users do this by pressing
a key or by choosing a pickup code that is uniform throughout the system.
One way to configure call pickup groups is with the AMO AUN. A call
pickup group is comprised of users from this node (analog or digital
devices). It is possible to connect such a group to a call pickup group
of an external OpenScape 4000 node in the framework of a network-wide
call pickup (over so-called "remote links", see Section 76.3,
"Network-wide Call Pickup").
- System-wide attributes:
You can use parameters (such as AMO ZAND, OPTISET branch, PICKOPT parameter) to select whether you must press the call pickup key on a Digite once (PICKOPT=NO) or twice (PICKOPT=YES) to pick up a call from a call pickup group. This is valid for the entire system. If the switch is YES, the first time you press the call pickup key in the digit input you go to the directed call pickup. You can then enter the destination number from which you want to pick up a call. In this mode, the second time you press the key the call is picked up from the call pickup group.
- Group-specific attributes:
For each call pickup group, you can set up the display of the calling user (DISTNO) and the delayed notification ring (NOTRNG). To be able to pick up second calls, you must specify PUSECOND=YES. You can use the parameter SIGNAL to define the type of signaling for incoming calls at the station devices of a group.
- User-specific attributes:
The subscriber class of service GRPCAL (for example, AMO COSSU) controls whether a user takes part in a group call (see Section 76.2.3, "Pickup Group Call"), that is, whether an arriving call is acoustically signaled (instead of via LED or display). This feature is also referred to as parallel call and is possible locally and network-wide in the framework of a call pickup group.
- Moving users from one call pickup group to another
You can move users or remote links from one call pickup group to another specific call pickup group with the AMO. You do not have to specify the original group number to do this; the AMO AUN determines it. You only need to specify the user(s) (or 1 remote link) and possibly the group to which you want to move the user(s) (destination group). It is also possible to move an area of users; the AMO AUN looks for the users from the respective groups and gathers them in the destination group. If you do not specify the destination group, the AMO AUN creates the next free group.
- Selecting call pickup groups during configuration or expansion
It is possible to identify a call pickup group by specifying the station number of a user who is a member of this group. (The parameter GRSTNO was introduced for this purpose.)
- Do not specify either parameter GRNO or GRSTNO in the ADD command: This creates the next, in increasing order, free call pickup group (for example, if groups 1, 2, 3, and 10 exist: group 4 is added).
- Specify only the parameter GRNO, not the parameter GRSTNO in the ADD command: This creates or expands the call pickup group identified by GRNO.
- Specify only the parameter GRSTNO, not the parameter GRNO in the ADD command: This creates or expands the call pickup group that already includes the user identified by GRSTNO.
- Specify both parameters (GRNO and GRSTNO) in the ADD command: Not allowed, commanded is rejected with an error.
- Deleting users from different call pickup groups
It is possible to leave out the group number (GRNO) in the DELETE command. In this case, the system determines the group in which a user is a member. You can also delete several users who are not members of the same call pickup group. They are removed from the respective groups.
- Type branch with display or regenerate in the AMO AUN.