Cisco Unified Sip Phone 3905 And Vlan Interaction - Cisco 3905 Administration Manual

Cisco Unified SIP Phone 3905 and VLAN Interaction

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
• Configuration file via TFTP service
• Phone registration
• Call preservation, so that a media session continues if signaling is lost between the primary
For information about configuring Cisco Unified Communications Manager to work with the IP devices
described in this chapter, see the "Cisco Unified IP Phone Configuration" chapter in the Cisco Unified
Communications Manager Administration Guide.
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:
tools.cisco.com/support/downloads/go/Redirect.x?mdfid=278875240
For more information, see the "Software Upgrades" chapter in the Cisco Unified Communications Operating
Note
System Administration Guide.
Related Topics
Security Configuration Menu, on page 44
Available telephony features, on page 47
Cisco Unified SIP Phone 3905 and VLAN Interaction
The Cisco Unified SIP Phone 3905 has 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
• 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:
Cisco Unified SIP Phone 3905 Administration Guide for Cisco Unified Communications Manager 8.6 (SIP)
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Communications Manager and a phone
not be available to assign the phone to the same subnet as other devices connected to the same port.
Cisco Unified IP Phone and Your Network
http://