Cisco 8961 Administration Manual page 229

Features, Templates, Services, and User Setup
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Parameter name
VXC VPN Option
Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager 10.0
Parameter description
This field indicates the type of VXC VPN support.
• Dual Tunnel: The phone establishes two VPN
tunnels, one for the phone and another for the
Cisco VXC device.
To ensure the highest quality of service for the
phone voice and video services, Cisco
recommends the Dual Tunnel setting, which is
the default setting. With two VPN tunnels, the
host Cisco Unified IP Phone can provide
prioritization of CPU and memory resources to
the data that associates with the phone voice
and with video functions over the data that
associates with the Cisco VXC VPN tunnel.
This approach requires two manual login entries,
depending on security parameters: one for the
phone VPN and another for the Cisco VXC
VPN. The two-tunnel approach also requires
two VPN concentrator ports and two IP
addresses.
• Single Tunnel: The phone establishes only one
VPN tunnel for the phone and the Cisco VXC
device to share.
For customers who are willing to trade off
potential voice and video quality for a simplified
operating model, the single VPN tunnel option
is available. All data travels over a single VPN
tunnel by sharing the available phone processor
and memory resources across the voice, video,
and Cisco VXC services. The IP phone does not
prioritize data handing of one service over
another. As a result, possible performance
degradation of the IP phone voice and video
media handling and UI functions may occur due
to IP phone CPU loading.
Default: Dual Tunnel
Cisco VXC VPN Setup
(SIP)
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