User's Manual

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Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.6 (SCCP and SIP)
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Chapter 2 Preparing to Install the Cisco Unified IP Phones on Your Network
Understanding Interactions with Other Cisco Unified IP Telephony Products
Understanding How the Cisco Unified IP Phones Interact 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—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
• Authentication and encryption (if configured for the telephony system)
• Configuration, certificate trust list (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, refer to Cisco Unified
Communications Manager Administration Guide, Cisco
Unified Communications Manager System Guide, and Cisco Unified Communications Manager Security
Guide.
For an overview of security functionality for the Cisco Unified IP Phones, see Understanding Security
Features for Cisco Unified IP Phones, page 1-11.
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 5-1
Understanding How the Cisco Unified IP Phones Interact with the VLAN
The Cisco Unified IP Phones 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 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 VoIP traffic.
• Network security may 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: