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Mitel NuPoint Messenger Technical Documentation - Release 7.0
 
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Bitmapped GCOSs are useful when you need to develop complex relationships.  The 
communication links required for the arrangement shown in Figure 8-3, for example, are 
possible only with a bitmapped GCOS.  
Dial-by-Name Considerations 
Even though mailbox owners may all be in the same Dial-by-Name database, they can only reach 
others in the database if they share either the same affinity group or if their bitmapped GCOSs 
have any of the same groups.  For example, Jane Doe, Lee Bau, and John Smith are all in the 
Dial-by-Name database, but Jane’s mailbox and Lee’s mailbox are configured with GCOS 1, a 
bitmapped GCOS, and John’s mailbox is configured with GCOS 65, an affinity group GCOS.  
Jane and Lee can reach each other but not John.  This grouping, sometimes called “Partitioned 
Dial-by-Name,” is illustrated in Figure 8-5. 
Figure 8-5 
Grouping Within the Dial-by Name Database 
Jane and Lee can be in different bitmapped GCOSs but can still communicate if both GCOSs 
include each of their group numbers.  
Recommendations for Degrees of Flexibility 
By default, GCOS 1 has all 128 groups defined, giving a mailbox with this GCOS the maximum 
flexibility in exchanging messages.  It is recommended that you do not alter this GCOS. 
It is also recommended that you create GCOS 2, but define no groups for it.  This “empty” GCOS 
is useful in restricting the capabilities of a mailbox.  It is also used to enable one-way 
communication, as described below. 
One-Way Communication Using an Empty GCOS 
Though you can prevent contact between users, you can allow them to receive certain kinds of 
messages, using an empty GCOS.  For example, you probably want to notify users before a 
system shutdown. 
To enable this one-way communication, an originating mailbox must have an FCOS that allows 
the originating mailbox to make messages and allows the mailbox owner to make or give 
(messages) to a mailbox with an empty GCOS, a GCOS you defined without including any 
groups in it.  The FCOS feature bits to accomplish this are: 
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020 (Make messages) 
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126 (Make/give to mailbox with empty GCOS) 
The receiving mailbox must have an FCOS that allows it to receive messages from other users 
(FCOS bit 040).  These features enable a user to make a message, as well as give messages 
from other users, to the mailbox with the empty GCOS. 
For example, suppose the local phone company notifies an answering service that maintenance 
on buried phone cables will disrupt service for two hours next week.  If all customers have 
mailboxes with the FCOS and empty GCOS just described, and if the system administrator’s 
mailbox has the same FCOS, the system administrator can notify users in advance of the system 
shut down. 
Interaction Between a GCOS and FCOS 
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