9-9
Cisco Unified IP Conference Station 7937G Administration Guide for Cisco Unified Communications Manager 6.0
OL-11560-01 Rev. B0
Chapter 9 Troubleshooting and Maintenance
General Troubleshooting Tips
Checking Power Connection
In most cases, a conference station will restart if it powers up using external power but loses that
connection and switches to Power over Ethernet (PoE). Similarly, a conference station may restart if it
powers up using PoE and then gets connected to an external power supply.
General Troubleshooting Tips
This section provides troubleshooting information for some common issues that might occur on the
conference station.
Table 9-1
provides general troubleshooting information for the conference station.
Table 9-1
Cisco Unified IP Conference Station 7937G Troubleshooting
Summary
Explanation
Changing the conference station
configuration
By default, the network configuration options are locked to
prevent users from making changes that could impact their
network connectivity. You must unlock the network
configuration options before you can configure them. See the
“Unlocking and Locking Options” section on page 4-3
for
details.
Codec mismatch between the
conference station and another
device
The RxType and the TxType statistics show the codec that is
being used for a conversation between this conference station
and the other device. The values of these statistics should
match. If they do not, verify that the other device can handle the
codec conversation or that a transcoder is in place to handle the
service.
See the
“Call Statistics Screen” section on page 7-4
for
information about displaying these statistics.
Dual-Tone Multi-Frequency (DTMF)
delay
When you are on a call that requires keypad input, if you press
the keys too quickly, some of them might not be recognized.
Gaps in voice calls
Check the Avg Jitter and the Max Jitter statistics. A large
variance between these statistics might indicate a problem with
jitter on the network or periodic high rates of network activity.
See the
“Call Statistics Screen” section on page 7-4
for
information about displaying these statistics.
Conference station does not ring
Check that the ringer setting is not “Ringer Off.” Check the
volume level.
LCD display issues
If the LCD screen appears to have rolling scan lines (beat
frequencies) or a wavy pattern, it might be interacting with
certain types of older fluorescent lights in the building. Moving
the conference station away from the lights, or replacing the
lights, should resolve the problem.