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Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 4.2, Cisco Unified IP Phones
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Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Understanding the Phone Startup Process
• Phone registration
• Call preservation, so that a media session continues if signaling is lost
between the primary CallManager and a phone)
For information about configuring Cisco Unified CallManager to work with the
IP devices described in this chapter, refer to Cisco Unified CallManager
Administration Guide, Cisco Unified CallManager System Guide, and to
Cisco Unified CallManager Security Guide.
For an overview of security for the Cisco Unified IP Phone, see the
“Understanding Security Features for Cisco Unified IP Phones” section on
page 1-12.
Note If the Cisco Unified IP Phone model that you want to configure does not appear
in the Phone Type drop-down list in Cisco Unified CallManager Administration,
go to the following URL and install the latest support patch for your version of
Cisco Unified CallManager:
http://www.cisco.com/kobayashi/sw-center/sw-voice.shtml
Related Topic
• Telephony Features Available for the Phone, page 5-2
Understanding How the Cisco Unified IP Phone Interacts with
the VLAN
The Cisco Unified IP Phone 7960G and 7940G have an internal Ethernet switch,
enabling forwarding of packets to the phone, and to the access port and the
network port on the back of the phone.
If a computer is connected to the access port, the computer and the phone share
the same physical link to the switch and share the same port on the switch. This
shared physical link has the following implications for the VLAN configuration
on the network:
• The current VLANs might be configured on an IP subnet basis. However,
additional IP address might not be available to assign the phone to the same
subnet as other devices connect to the same port.
