Cisco 7975G Administration Guide

9-4
Cisco Unified IP Phone 7975G Administration Guide for Cisco Unified Communications Manager 6.0
OL-12642-01
Chapter 9 Troubleshooting and Maintenance
Resolving Startup Problems
• IP Address, Subnet Mask, Default Router—If you have assigned a static IP address to the phone,
you must manually enter settings for these options. See the “Network Configuration Menu” section
on page 4-5 for instructions.
If you are using DHCP, check the IP addresses distributed by your DHCP server. Refer to Understanding
and Troubleshooting DHCP in Catalyst Switch or Enterprise Networks, available at this URL:
http://www.cisco.com/warp/customer/473/100.html#41
Verifying DNS Settings
If you are using DNS to refer to the TFTP server or to Cisco Unified Communications Manager, you
must ensure that you have specified a DNS server. Verify this setting by pressing the Settings button on
the phone, choosing Network Configuration, and scrolling to the DNS Server 1 option. You should
also verify that there is a CNAME entry in the DNS server for the TFTP server and for the
Cisco
Unified Communications Manager system.
You must also ensure that DNS is configured to do reverse look-ups.
Verifying Cisco Unified Communications Manager Settings
On the Cisco Unified IP Phone, press the Settings button, choose Device Configuration, and look at
the CallManager Configuration options. The Cisco
Unified IP Phone attempts to open a TCP
connection to all the Cisco
Unified Communications Manager servers that are part of the assigned
Cisco
Unified Communications Manager group. If none of these options contain IP addresses or show
Active or Standby, the phone is not properly registered with Cisco
Unified Communications Manager.
See the
“Registering the Phone with Cisco Unified Communications Manager” section on page 9-5 for
tips on resolving this problem.
Cisco Unified Communications Manager and TFTP Services Are Not Running
If the Cisco Unified Communications Manager or TFTP services are not running, phones may not be
able to start up properly. However, in such a situation, it is likely that you are experiencing a
system-wide failure and that other phones and devices are unable to start up properly.
If the Cisco Unified Communications Manager service is not running, all devices on the network that
rely on it to make phone calls will be affected. If the TFTP service is not running, many devices will not
be able to start up successfully.
To start a service, follow these steps:
Procedure
Step 1 From Cisco Unified Communications Manager Administration, choose Serviceability from the
Navigation drop-down list.
Step 2 Choose Tools > Control Center - Feature Services.
Step 3 Choose the primary Cisco Unified Communications Manager server from the Server drop-down list.
The page displays the service names for the server that you chose, the status of the services, and a service
control panel to stop or start a service.
Step 4 If a service has stopped, click its radio button and then click the Start button.

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