Information Technology Reference
In-Depth Information
Although you can configure many additional features, these three are necessary to get the
phone system up and running. Example 5-4 illustrates this configuration.
Example 5-4
Provisioning CME Phone and Directory Number Support
CME_Voice(config)#
telephony-service
CME_Voice(config-telephony)#
ip source-address 172.16.1.1
CME_Voice(config-telephony)#
max-ephones ?
<1-30> Maximum phones to support
CME_Voice(config-telephony)#
max-ephones 24
CME_Voice(config-telephony
)# max-dn ?
<1-150> Maximum directory numbers supported
<cr>
CME_Voice(config-telephony)#
max-dn 48
The max-ephones parameter configures the maximum number of IP phones the router will
support, whereas the max-dn parameter specifies the maximum number of directory num-
bers. The
ip source-address
command enables the router to know which IP address will
receive registration requests from the IP phones.
Note:
The max-ephones and max-dn parameters directly affect how much memory the
router reserves to support the CME service. Setting the value much higher than you actually
need might reserve excessive resources on your router and impact other network services.
In addition, the max-ephones parameter should not be any higher than the number of fea-
ture licenses you have purchased for your CME system.
At this point, CME is nearly ready. The Cisco IP Phone has come to the CME router and
said, “I want to use you as my call processing device.” The CME router receives this re-
quest and says, “Great! But, who are you?” The CME router delivers no additional config-
uration to the IP phone because you have yet to enter it. So, let's enter away! Welcome to
the world of ephones and ephone-dn.
In the movie
The Matrix
, Thomas Anderson (also known as Neo) finds out that the world
around him is not real, but rather a computer-generated environment. He soon becomes a
part of the Resistance, who fights against the forces behind this computer-generated
world. He meets up with Morpheus, who teaches him more about this new world. Let's
pick up with their dialog here:
Morpheus: “This is the construct. It's our loading program. We can load anything
from clothing, to equipment, weapons, training simulations, anything we need.”
Neo: “Right now, we're inside a computer program?”
Morpheus: “Is it really so hard to believe? Your clothes are different. The plugs in
your arms and head are gone. Your hair is changed. Your appearance now is what we
call residual self image. It is the mental projection of your digital self.”
