Cisco 7975G Troubleshooting And Maintenance

Solution
Re-sign the configuration file by using the correct certificate.
Phone Does Not Register
Problem
Phone does not register with Cisco Unified Communications Manager.
Cause
The CTL file does not contain the correct information for the Cisco Unified Communications Manager server.
Solution
Change the Cisco Unified Communications Manager server information in the CTL file.
Signed Configuration Files Are Not Requested
Problem
Phone does not request signed configuration files.
Cause
The CTL file does not contain any TFTP entries with certificates.
Solution
Configure TFTP entries with certificates in the CTL file.
802.1X Authentication Problems
802.1X authentication problems can be broken into the categories described in the following table.
Table 1: Identifying 802.1X Authentication Problems
SeeIf all the following conditions apply,
802.1X Enabled on Phone but Phone Does Not
Authenticate, on page 10
• Phone cannot obtain a DHCP-assigned IP
address.
• Phone does not register with Cisco Unified
Communications Manager.
• Phone status displays as “Configuring IP” or
“Registering.”
• 802.1X Authentication Status displays as “Held”
(see 802.1X Authentication and Status Menus
for more details).
• Status menu displays 802.1X status as “Failed”
(see Status Menu for more details).
Troubleshooting and Maintenance
9
Troubleshooting and Maintenance
Phone Does Not Register

Cisco 7975G Specifications

General

Handset type	Wired handset
Product type	IP Phone
Product color	Grey, Silver
Speakerphone	Yes
Voice codecs	G.711Mu, G.711a, G.722, G.729A, iLBC
Number of melodies	24
Aspect ratio	4:3
Display diagonal	5.6 \
Display resolution	320 x 240 pixels
Lines quantity	8 lines
Phonebook capacity	- entries
Number of VoIP accounts	-
Front camera	No
Security algorithms	128-bit AES
Networking standards	IEEE 802.1Q, IEEE 802.1p, IEEE 802.1x, IEEE 802.3af
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Ethernet LAN interface type	Gigabit Ethernet
Supported network protocols	DHCP, TFTP
Volume control	Digital
Headphone outputs	1
Ethernet LAN (RJ-45) ports	2
Number of handles included	1 pc(s)
AC adapter output voltage	48 V
Storage temperature (T-T)	-10 - 60 °C
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	10 - 95 %
Certification	FCC

Weight and Dimensions

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