Cisco 7940G Administration Guide

CHAPTER
7-1
Cisco Unified IP Phone 7960G/7940G Administration Guide for Cisco Unified Communications Manager 7.0 (SIP)
OL-15499-01
7
Troubleshooting and Maintenance
This chapter provides information that can assist you in troubleshooting problems with your
Cisco
Unified IP Phone or in your IP telephony network.
For additional troubleshooting information, refer to the Using the 79xx Status Information For
Troubleshooting tech note. This document is available to registered Cisco.com users at this URL:
http://www.cisco.com/warp/customer/788/AVVID/telecaster_trouble.html
If you need additional troubleshooting assistance, you can contact the Cisco TAC. The phone generates
detailed logs that can assist the Cisco TAC with troubleshooting and resolving problems.
This chapter includes these topics:
• Resolving Startup Problems, page 7-1
• Cisco Unified IP Phone Resets Unexpectedly, page 7-6
• Troubleshooting Cisco Unified IP Phone Security, page 7-9
• General Troubleshooting Tips for the Cisco Unified IP Phone, page 7-9
• Resetting or Restoring the Cisco Unified IP Phone, page 7-12
• Where to Go for More Troubleshooting Information, page 7-13
• Cleaning the Cisco Unified IP Phone, page 7-13
Resolving Startup Problems
After installing a Cisco Unified IP Phone into your network and adding it to
Cisco
Unified Communications Manager, the phone should start up as described in the “Verifying the
Phone Startup Process” section on page 3-8. If the phone does not start up properly, see the following
sections for troubleshooting information:
• Symptom: The Cisco Unified IP Phone Does Not Go Through its Normal Startup Process, page 7-2
• Symptom: The Cisco Unified IP Phone Does Not Register with Cisco Unified Communications
Manager, page 7-2
• Symptom: Cisco Unified IP Phone Unable to Obtain IP Address, page 7-6

Cisco 7940G Specifications

General

Keypad number of keys	12
Touchscreen	-
Speakerphone	Yes
Voice codecs	G.711, G.729a
Bluetooth	No
Supported network protocols	DHCP, SCCP, SIP, MGCP
Ethernet LAN (RJ-45) ports	2
Input voltage	48 V
Dimensions (WxDxH)	266.7 x 152.4 x 203.2 mm
Storage temperature (T-T)	-10 - 60 °C
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	10 - 95 %
Handset type	Wired handset
Product type	IP Phone
Product color	Gray
Safety	(UL) 60950, (CSA) C22.2 No. 60950
Certification	CE (FCC) 15 (CFR 47) B ICES-003 B EN55022 B CISPR22 B AS/NZ 3548 B VCCI B EN55024 EN 50082-1 EN 61000-3-2 EN 61000-3-3 FCC 68 (CFR47) HAC IC CS-03
Compliance industry standards	IEEE 802.3, IEEE 802.3u, IEEE 802.1Q
Lines quantity	- lines
Phonebook capacity	- entries
Number of handles included	1 pc(s)

Weight and Dimensions

Weight	1600 g