Cisco CTS-500 Configuration Manual page 87

Chapter 3 Verifying and Troubleshooting the Cisco TelePresence System Configuration
Table 3-1 Troubleshooting the Cisco TelePresence Configuration
Problem
Cisco Unified IP Phone 7975
goes dead during
CTS endpoint or MIDlet
upgrade.
On some CTS 500
installations, the
Cisco Unified IP Phone
rejects a direct firmware
upgrade.
OL-21851-01
Possible Cause
Phone Firmware Issues
Occasionally, an unexpected phone power
cycle can occur during a CTS endpoint or
MIDlet version upgrade. During
CTS endpoint upgrades, the CTS briefly
powers off the phone then brings it back up
when upgrade is complete. But if the phone
power cycle is occurring at the same time, the
phone's firmware image can be damaged and
the phone will not power back on.
During installation, Cisco Unified
Communications Manager will
automatically upgrade the firmware on
Cisco Unified IP Phone 7975 to the
minimum version required. But if the
firmware on the IP phone is outdated, the
phone may reject the direct firmware
upgrade.
Cisco Unified Communications Manager Configuration Guide for the Cisco TelePresence System
Troubleshooting Your Configuration
Possible Solutions
To avoid this problem, schedule CTS endpoint
or MIDlet upgrades when the phone is not in
power cycle mode.
If you encounter a phone that will not power
back on after a CTS endpoint or MIDlet
upgrade, perform a phone factory reset to
restore the firmware image. See
Cisco Unified IP Phone 7970 Series Factory
Image.
Upgrade the IP phone 7975 to an intermediate
unsigned firmware version before upgrading to
the final firmware required by the endpoint.
Resetting the
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