Name: Cisco 7931G
Brand: Cisco
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Cisco Unified IP Phone 7931G Administration Guide for Cisco Unified Communications Manager 8.0 (SCCP and SIP)

OL-20798-01

Chapter 9 Troubleshooting and Maintenance

Where to Go for More Troubleshooting Information

Note Voice quality metrics do not account for noise or distortion, only frame loss.

Where to Go for More Troubleshooting Information

If you have additional questions about troubleshooting the Cisco Unified IP Phones, several Cisco.com

web sites can provide you with more tips. Choose from the sites available for your access level.

• Cisco Unified IP Phone Troubleshooting Resources:

http://www.cisco.com/en/US/products/hw/phones/ps379/tsd_products_

support_series_home.html

• Cisco Products and Services (Technical Support and Documentation):

http://www.cisco.com/en/US/products/sw/voicesw/tsd_products_support_

category_home.html

Cleaning the Cisco Unified IP Phone

To clean your Cisco Unified IP Phone, use a soft, dry cloth to wipe the phone and the screen. Do not

apply liquids or powders directly on the phone. As with all non-weather-proof electronics, liquids and

powders can damage the components and cause failures.

Conceal Ratio and

Conceal Seconds

increase significantly

• Network impairment from packet loss or high jitter.

Conceal Ratio is near

or at zero, but the

voice quality is poor

• Noise or distortion in the audio channel such as echo or audio levels.

• Tandem calls that undergo multiple encode/decode such as calls to a

mobile network or calling card network.

• Acoustic problems coming from a speakerphone, hands-free mobile phone

or wireless headset.

Check packet transmit (TxCnt) and packet receive (RxCnt) counters to verify

that voice packets are flowing.

Table 9-4 Changes to Voice Quality Metrics

Metric Change Condition

Cisco 7931G Specifications

General

Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Product color	Black
Wall mountable	Yes
Electromagnetic compatibility	FCC Part 15 (CFR 47) Class B, ICES-003 Class B, EN55022 Class B, CISPR22 Class B, AS/NZS CISPR 22 Class B, CISPR 24, VCCI Class B, EN55024, EN 50082-1, EN 61000-3-2, EN 61000-3-3, EN 61000-6-1
Wi-Fi	No
Networking standards	IEEE 802.1Q, IEEE 802.1af, IEEE 802.1p
Ethernet LAN interface type	Fast Ethernet
Supported network protocols	DHCP, TFTP, CDP
Lines quantity	24 lines
Phonebook capacity	- entries
Number of VoIP accounts	-
Voice codecs	G.711a, G.729A, G.729B, G.729ab
Volume control	Digital
Display resolution	192 x 64 pixels
Display number of lines	3 lines
Display number of colors	Monochrome
Storage temperature (T-T)	-10 - 60 °C
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	10 - 95 %
Safety	(UL) 60950, (CSA) C22.2 No. 60950, EN 60950, IEC 60950, AS/NZS60950, TS 001
Number of handles included	1 pc(s)