Specifications
Working with a Key Voice System 
Printed in the USA  Page 21  GCA39-826 Rev 1, Issue 9/01 
Understanding How the Key Voice System Routes Calls It Receives 
from the Phone System 
A Key Voice system is attached to a phone system in the same manner as other telephone 
extensions are connected to the phone system. The ports running between the phone system and 
the Key Voice system each have unique extension numbers. 
For the Key Voice system to answer calls, a technician must program the phone system to pass 
each call to the Key Voice system over one of the ports connecting the two systems. In many 
instances, a technician will put all the extensions of the ports connecting the Key Voice system 
and the phone system into a hunt group. The technician will then program the phone system to 
pass calls to the hunt group, which transfers each call to the Key Voice system over a non-busy 
port. 
When the phone system passes an incoming call to the Key Voice system, the call is processed 
according to the following general procedure: 
1.  The Key Voice system goes off-hook and listens for integration digits sent by the phone 
system with the call. Whether and what type of integration digits a phone system passes to 
the Key Voice system depends on the phone system. Integration digits include information 
about the call. For example, if the call is a new call coming in from an outside line, the 
integration digits passed to the Key Voice system with the call may identify the line on which 
the call came in. If the call was to an extension on the phone system that rang and was not 
answered, the extension may forward the call back to the Key Voice system (so the caller will 
be prompted to leave a voice mail message) along with integration digits that identify the 
number of the extension the caller was attempting to reach. 
Holiday dates 
are defined on 
this screen. 










