Cisco 7931G Administration Guide

6-3
Cisco Unified IP Phone 7931G Administration Guide for Cisco Unified Communications Manager 8.0 (SCCP and SIP)
OL-20798-01
Chapter 6 Customizing the Cisco Unified IP Phone
Configuring Wideband Codec
PCM File Requirements for Custom Ring Types
The PCM files for the rings must meet the following requirements for proper playback on
Cisco Unified IP Phones:
• Raw PCM (no header)
• 8000 samples per second
• 8 bits per sample
• uLaw compression
• Maximum ring size—16080 samples
• Minimum ring size—240 samples
• Number of samples in the ring is evenly divisible by 240.
• Ring starts and ends at the zero crossing.
• To create PCM files for custom phone rings, you can use any standard audio editing packages that
support these file format requirements.
Configuring a Custom Phone Ring
To create custom phone rings for the Cisco Unified IP Phone 7931G, follow these steps:
Procedure
Step 1 Create a PCM file for each custom ring (one ring per file). Ensure the PCM files comply with the format
guidelines that are listed in PCM File Requirements for Custom Ring Types, page 6-3.
Step 2 Upload the new PCM files that you created to the Cisco TFTP server for each
Cisco Unified Communications Manager in your cluster. For more information, see the “Software
Upgrades” chapter in Cisco Unified Communications Operating System Administration Guide.
Step 3 Use an text editor to edit the Ringlist.xml file. See Ringlist.xml File Format Requirements, page 6-2 for
information about how to format this file and for a sample Ringlist.xml file.
Step 4 Save your modifications and close the Ringlist.xml file.
Step 5 To cache the new Ringlist.xml file, stop and start the TFTP service by using Cisco Unified Serviceability
or disable and re-enable the Enable Caching of Constant and Bin Files at Startup TFTP service parameter
(located in the Advanced Service Parameters).
Configuring Wideband Codec
If Cisco Unified Communications Manager has been configured to use G.722 (G.722 is enabled by
default for the Cisco Unified IP Phone 7931G) and if the far endpoint supports G.722, the call can
connect using the G.722 codec in place of G.711. In this case, the user may notice greater audio
sensitivity during the call. Greater sensitivity means improved audio clarity but also means that more
background noise can be heard by the far endpoint—noise such as rustling papers or nearby
conversations. Even without a wideband headset, some users may prefer the additional sensitivity of
G.722. Other users may be distracted by the additional sensitivity of G.722.

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)

Weight and Dimensions

Depth	229 mm
Width	203 mm
Height	178 mm
Weight	1360 g