Cisco 7962G Administration Manual page 173

Chapter 9 Troubleshooting and Maintenance
Table 9-2 Cisco Unified IP Phone Troubleshooting (continued)
Summary
Cisco VT Advantage/Unified Video
Advantage (CVTA)
Phone call cannot be established
Call established with the iLBC
protocol does not show that the iLBC
codec is being used
OL-12641-01
Explanation
If you are having problems getting CVTA to work, make sure
that the PC Port is enabled and that CDP is enabled on the PC
port.
See Network Configuration Menu, page 4-5
information.
The phone does not have a DHCP IP address, is unable to
register to Cisco Unified Communications Manager, and shows
a Configuring IP or Registering message.
Verify the following:
1. The Ethernet cable is attached.
2. The Cisco CallManager service is running on the Cisco
Unified Communications Manager server.
3. Both phones are registered to the same Cisco Unified
Communications Manager.
Audio server debug and capture logs are enabled for both
4.
phones. If needed, enable Java debug.
Call statistics display does not show iLBC as the
receiver/sender codec.
Check the following using the Cisco Unified
1.
Communications Manager administration pages:
Both phones are in the iLBC device pool.
–
The iLBC device pool is configured with the iLBC
–
region.
The iLBC region is configured with the iLBC codec.
–
Capture a sniffer trace between the phone and Cisco
2.
Unified Communications Manager and verify that SCCP
messages,OpenReceiveChannel, and
StationMediaTransmit messages have media payload type
value equal to 86. If so, the problem is with the phone;
otherwise the problem is with the Cisco Unified
Communications Manager configuration.
Enable audio server debug and capture logs from both
3.
phones. If needed, enable Java debug.
Cisco Unified IP Phone 7962G and 7942G Administration Guide for Cisco Unified Communications Manager 6.0
General Troubleshooting Tips
for more
9-13