Cisco 7941G Administration Manual page 248

General Troubleshooting Information
Summary
Peer Firmware Sharing fails.
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
Cisco Unified IP Phone 7941G, 7941G-GE, 7942G, 7961G, 7961G-GE, and 7962G Administration Guide for Cisco
Unified Communications Manager 9.0 (SCCP and SIP)
228
Explanation
If the Peer Firmware Sharing fails, the phone will default to using
the TFTP server to download firmware. Access the log messages
stored on the remote logging machine to help debug the Peer
Firmware Sharing feature.
These log messages are different from the log messages
Note
sent to the phone log.
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, on page 64
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.
4 Audio server debug and capture logs are enabled for both
phones. If needed, enable Java debug.
Call statistics display does not show iLBC as the receiver/sender
codec.
1 Check the following by using Cisco Unified Communications
Manager Administration:
• 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.
2 Capture a sniffer trace between the phone and Cisco 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.
3 Enable audio server debug and capture logs from both phones.
If needed, enable Java debug.
Troubleshooting and Maintenance
for more