Cisco 7962G Administration Guide

9-7
Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 7.1
OL-18913-01
Chapter 9 Troubleshooting and Maintenance
Cisco Unified IP Phone Resets Unexpectedly
Verifying DHCP Settings
The following suggestions can help you determine if the phone has been properly configured to use
DHCP:
1. Verify that you have properly configured the phone to use DHCP. See the “Network Configuration
Menu” section on page 4-5 for more information.
2. Verify that the DHCP server has been set up properly.
3. Verify the DHCP lease duration. Cisco recommends that you set it to 8 days.
Cisco Unified IP Phones send messages with request type 151 to renew their DHCP address leases. If
the DHCP server expects messages with request type 150, the lease will be denied, forcing the phone to
restart and request a new IP address from the DHCP server.
Checking Static IP Address Settings
If the phone has been assigned a static IP address, verify that you have entered the correct settings. See
the “Network Configuration Menu” section on page 4-5 for more information.
Verifying the Voice VLAN Configuration
If the Cisco Unified IP Phone appears to reset during heavy network usage (for example, following
extensive web surfing on a computer connected to the same switch as the phone), it is likely that you do
not have a voice VLAN configured.
Isolating the phones on a separate auxiliary VLAN increases the quality of the voice traffic. See the
“Understanding How the Cisco Unified IP Phone Interacts with the VLAN” section on page 2-2 for
details.
Verifying that the Phones Have Not Been Intentionally Reset
If you are not the only administrator with access to Cisco Unified Communications Manager, you should
verify that no one else has intentionally reset the phones.
You can check whether a Cisco Unified IP Phone received a command from Cisco Unified
Communications Manager to reset by pressing the Settings button on the phone and choosing Status >
Network Statistics. If the phone was recently reset one of these messages appears:
• Reset-Reset—Phone closed due to receiving a Reset/Reset from Cisco Unified Communications
Manager Administration.
• Reset-Restart—Phone closed due to receiving a Reset/Restart from Cisco Unified Communications
Manager Administration.
Eliminating DNS or Other Connectivity Errors
If the phone continues to reset, follow these steps to eliminate DNS or other connectivity errors:

Cisco 7962G Specifications

General

Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Case material	ABS
Product color	Black, Grey
Wall mountable	Yes
Bluetooth	No
Security algorithms	128-bit AES, 802.1x RADIUS
Networking standards	IEEE 802.1Q, IEEE 802.1p, IEEE 802.1x, IEEE 802.3af
Ethernet LAN data rates	10, 100 Mbit/s
Ethernet LAN interface type	Fast Ethernet
Ethernet LAN (RJ-45) ports	2
Voice codecs	G.711, G.711a, G.722, G.729A, G.729ab, iLBC
Volume control	Digital
Display diagonal	5 \
Display resolution	320 x 222 pixels
Display number of colors	Monochrome
Caller ID	-
Lines quantity	- lines
Phonebook capacity	- entries
Storage temperature (T-T)	-10 - 60 °C
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	10 - 95 %
Number of handles included	1 pc(s)

Weight and Dimensions

Depth	203.2 mm
Width	266.7 mm
Height	152.4 mm
Weight	1600 g