Cisco 7975G Troubleshooting And Maintenance

ExplanationSummary
Call statistics display does not show iLBC as the
receiver/sender codec.
1. Check the following by using Cisco Unified
Communications Manager Administration:
• Both phones are in the iLBC device pool.
• The iLBC device pool is configured with the
iLBC region.
• The iLBC region is configured with the iLBC
codec.
2. Capture a sniffer trace between the phone and
Cisco Unified Communications Manager and
verify that SCCP messages, OpenReceiveChannel,
and StationMediaTransmit messages have media
payload type value equal to 86. If so, the problem
is with the phone; otherwise, the problem is with
the Cisco Unified Communications Manager
configuration.
3. Enable audio server debug and capture logs from
both phones. If needed, enable Java debug.
Call established with the iLBC protocol does not show
that the iLBC codec is being used
General Troubleshooting Tips for Cisco Unified IP Phone Expansion Module
The following table provides general troubleshooting information for the Cisco Unified IP Phone Expansion
Module.
Table 3: Cisco Unified IP Phone Expansion Module Troubleshooting
SolutionProblem
Verify that all of the cable connections are correct.
Verify that you have power to the Cisco
Unified IP Phone Expansion Module.
No display on the Cisco Unified IP Phone Expansion
Module.
Verify that the Cisco Unified IP Phone Expansion
Module is configured in Cisco
Unified Communications Manager.
Lighted buttons on the first Cisco Unified IP Phone
Expansion Module are all red.
Verify that the Cisco Unified IP Phone Expansion
Module is configured in Cisco
Unified Communications Manager.
Lighted buttons on the second Cisco Unified IP Phone
Expansion Module are all amber.
Troubleshooting and Maintenance
19
Troubleshooting and Maintenance
General Troubleshooting Tips for Cisco Unified IP Phone Expansion Module

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