Cisco 7941G 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 2: 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
20
Troubleshooting and Maintenance
General Troubleshooting Tips for Cisco Unified IP Phone Expansion Module

Cisco 7941G Specifications

General

Keypad number of keys	12
Touchscreen	-
Display resolution	320 x 222 pixels
Speakerphone	Yes
Voice codecs	G.729a
Bluetooth	No
Supported network protocols	DHCP, TFTP, SCCP, DSCP
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, IEC 60950, EN 60950, AS/NZS 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
Compliance industry standards	IEEE 802.3, IEEE 802.3u, IEEE 802.1Q, IEEE 802.3af
Lines quantity	- lines
Phonebook capacity	- entries
Number of handles included	1 pc(s)

Weight and Dimensions

Weight	1600 g