Administrator's Manual 10. Diagnosing Problems & Troubleshooting
Version 3.4.3 177 400HD Series IP Phones
10 Diagnosing Problems & Troubleshooting
10.1 Recovering Phone Firmware
If the phone is powered off for some reason during the firmware upgrade process, the phone
becomes unusable. See Appendix D for detailed information. The phone firmware recovery
process is also available when the phone is connected to a VLAN.
To recover the phone firmware:
1. Make sure your DHCP server supports Options 66 (TFTP server address) and 67
(firmware file), and that these are configurable.
2. Before connecting the phone, verify that the TFTP server is running and the firmware
file for recovery is located in the correct location.
3. Connect your phone to the IP network, and then connect the phone to the power outlet;
a. The phone sends a TFTP request to the IP address indicated in the DHCP Option
66 field to retrieve the firmware file indicated in the DHCP Option 67 field.
b. The phone, in the DHCP Discover message sends its model name in the DHCP
Option 77 field. The DHCP server, according to the phone model, sets the
appropriate firmware file name in the DHCP Option 67 field sent to the phone
(e.g., 440HD_2.2.2.img).
c. The phone then upgrades to the recovery firmware.
d. After the firmware upgrade process completes, the phone boots up successfully.
10.2 Configuring System Logging (Syslog)
The System Logging (Syslog) feature is used for traffic analysis and debugging.
To configure system logging:
• Use the table as reference.
Table 10-1: Syslog Parameters
Parameter Description
system/syslog/mode Enables Syslog. Possible values are:
• LOCAL (Default)
• NETWORK = Syslog is sent to the Syslog server
(recommended)
• SERIAL = Syslog is sent to the phone console
(You need to connect a serial cable to view the
logs; this causes delays in the phone operation).
• ALL = Syslog sends to the Syslog server and to
system/syslog/log_level Default: DETAILED. Defines the log level.
system/syslog/sip_log_filter Default: 0. Defines the SIP log filter.
system/syslog/server_address
The IP address (in dotted-decimal notation) of the
computer you are using to run the Syslog server
(e.g., Wireshark). The Syslog server is an application
designed to collect the logs and error messages
generated by the phone. The default IP address is
0.0.0.0. Note: This parameter is applicable when
Activate is set to Network or Both.
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