Checking Power Connection; General Troubleshooting Tips - Cisco 7937G - Unified IP Conference Station VoIP Phone Administration Manual

Chapter 9 Troubleshooting and Maintenance

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
Table 9-1
Summary
Changing the conference station
configuration
Codec mismatch between the
conference station and another
device
Dual-Tone Multi-Frequency (DTMF)
delay
Gaps in voice calls
Conference station does not ring
LCD display issues
Cisco Unified IP Conference Station 7937G Administration Guide for Cisco Unified Communications Manager 6.0
OL-11560-01 Rev. B0
provides general troubleshooting information for the conference station.
Cisco Unified IP Conference Station 7937G Troubleshooting
Explanation
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
details.
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
information about displaying these statistics.
When you are on a call that requires keypad input, if you press
the keys too quickly, some of them might not be recognized.
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
information about displaying these statistics.
Check that the ringer setting is not "Ringer Off." Check the
volume level.
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.
General Troubleshooting Tips
for
for
for
9-9