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Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager 8.5 (SIP)
OL-20861-01
Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Understanding Interactions with Other Cisco Unified IP Telephony Products
Understanding How the Cisco Unified IP Phone Interacts with Cisco Unified
Communications Manager
Cisco Unified Communications Manager is an open and industry-standard call processing system.
Cisco Unified Communications Manager software sets up and tears down calls between phones,
integrating traditional PBX functionality with the corporate IP network. Cisco Unified Communications
Manager manages the components of the IP telephony system, such as the phones, the access gateways,
and the resources necessary for features such as call conferencing and route planning. Cisco Unified
Communications Manager also provides:
• Firmware for phones
• Configuration file, CTL, and Identity Trust List (ITL) files via the TFTP service
• Phone registration
• Call preservation, so that a media session continues if signaling is lost between the primary
Communications Manager and a phone
For information about configuring Cisco Unified Communications Manager to work with the IP devices
described in this chapter, go to the Cisco Unified IP Phone Configuration chapter in the
Cisco Communications Manager Administration Guide.
For an overview of security functionality for the Cisco Unified IP Phone, see the “Understanding
Security Features for Cisco Unified IP Phones” section on page 1-15.
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 Communications Manager Administration, go to the following URL and
install the latest support patch for your version of Cisco Unified
Communications Manager:
http://www.cisco.com/kobayashi/sw-center/sw-voice.shtml
Related Topic
• Telephony Features Available for the Cisco Unified IP Phone, page 8-2
Understanding How the Cisco Unified IP Phone Interacts with the VLAN
The Cisco Unified IP Phone 8961, 9951, and 9971 have an internal Ethernet switch, enabling forwarding
of packets to the phone, and to the Computer (access) port and the Network port on the back of the phone.
If a computer is connected to the Computer (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 addresses
might not be available to assign the phone to the same subnet as other devices connected to the same
port.
• Data traffic present on the VLAN supporting phones might reduce the quality of Voice-over-IP
traffic.
• Network security may indicate a need to isolate the VLAN voice traffic from the VLAN data traffic.
You can resolve these issues by isolating the voice traffic onto a separate VLAN. The switch port that
the phone is connected to would be configured to have separate VLANs for carrying: