General Troubleshooting Tips - Cisco 7941G - Unified IP Phone VoIP Administration Manual

General Troubleshooting Tips

Table 9-1 Cisco Unified IP Phone Security Troubleshooting (continued)
Problem
Factory Reset Deleted 802.1X Shared Secret
Phone cannot obtain a
DHCP-assigned IP address
Phone does not register with
Cisco Unified Communications
Manager
Phone status display as
"Configuring IP" or "Registering"
Cannot access phone menus to
verify 802.1X status
General Troubleshooting Tips
Table 9-2 Cisco Unified IP Phone Troubleshooting
Summary
Connecting a Cisco Unified IP Phone
to another Cisco Unified IP Phone
Poor quality when calling digital cell
phones using the G.729 protocol.
Cisco Unified IP Phone 7961G/7961G-GE and 7941G/7941G-GE for Cisco Unified Communications Manager 6.1
9-14
Possible Cause
These errors typically indicate that the phone has completed a
factory reset while 802.1X was enabled. A factory reset deletes
the shared secret, which is required for 802.1X authentication
and network access. To resolve this, you have two options:
Temporarily disable 802.1X on the switch.
•
Temporarily move the phone to a network environment that
•
is not using 802.1X authentication.
Once the phone starts up normally in one of these conditions,
you can access the 802.1X configuration menus and re-enter the
shared secret.
Table 9-2 provides general troubleshooting information for the Cisco Unified IP
Phone.
Explanation
Cisco does not support connecting an IP phone to another IP
phone through the PC port. Each IP phone should directly
connect to a switch port. If phones are connected together in a
line (by using the PC port), the phones will not work.
In Cisco Unified Communications Manager, you can configure
the network to use the G.729 protocol (the default is G.711).
When using G.729, calls between an IP phone and a digital
cellular phone will have poor voice quality. Use G.729 only
when absolutely necessary.
Chapter 9 Troubleshooting and Maintenance
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