Cisco 8961 Administration Manual page 306

VXC VPN Troubleshooting
Cause
The transmission speed of the connection is insufficient for the audio and video demands of the phone.
Solution
Upgrade the transmission speed to 1000-BaseT/full duplex.
VXC VPN Troubleshooting
When you are experiencing problems associated with the Virtualization Experience Client (VXC) Virtual
Private Network (VPN), use this section to troubleshoot the problems.
Phone Does Not Set Up VXC VPN Tunnel
Problem
The VXC is on and physically connected with phone using the spine connector and network cable, but the
VXC VPN status is not connected.
Solution
Perform the following steps:
1 Verify that:
a The phone is powered by the adapter.
b VXC is shown in accessories menu. If not, power cycle the phone.
c VPN status is connected.
2 Power cycle VXC device.
Identify VXC VPN Connection Problems
Use these steps to identify problems with the VXC VPN connection.
Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager
10.0 (SIP)
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Troubleshooting and Maintenance