System Components
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A major benefit of Hybrid mode is that it allows users who have system phones 
with fewer buttons to have access to multiple outside lines and various types of 
pools. You can make efficient use of outside lines by grouping those of a similar 
type or function together. For example, you can create an auxiliary pool of WATS 
or international lines and assign the pools to different groups of users. 
Additionally, individual lines can be assigned to a manager’s extension so that he 
or she always has access to an outside line.
In Hybrid mode, extension 10 
always 
operates like an extension in Key mode. This 
means that every outside line in the system is associated with a specific line 
button at extension 10.
All other extensions can be set up with access to only lines, only pools, or a 
combination of lines and pools:
■ Those extensions that have pool buttons, even if they also have individual 
line buttons, are called 
pooled extensions. 
■ Those extensions that have only line buttons (including extension 10) are 
called 
key extensions. 
Key extensions cannot access pools.
If your system is configured for Hybrid mode, keep in mind:
■ A line can be assigned to only one pool.
■ Individual extensions can be restricted access to specific pools.
■ Individual lines can be assigned to an extension with pool buttons as long 
as the lines are not part of any pool.
At installation, the system assigns all outside lines to the main pool and assigns 
the main pool to the two leftmost buttons on the bottom row of all system phones, 
except extension 10. If desired, you can remove some of the lines from the main 
pool and create auxiliary pools. Then, you can assign pools and/or individual lines 
on a per extension basis.
FCC Registration
In the continental U.S., your system’s mode of operation must be registered with 
the FCC as either KF (Key Function) for Key or MF (Multifunction) for Hybrid. If the 
system is registered as KF, no outside lines can be pooled; if the system is 
registered as MF, lines can be pooled and individual lines also can be assigned 
directly to line buttons.