Cisco 6800 Series Administration Manual

Troubleshooting
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General Troubleshooting Information
The following table provides general troubleshooting information for the Cisco IP Phone.
Table 1: Cisco IP Phone Troubleshooting
Summary
Connecting a Cisco IP Phone to
another Cisco IP Phone
Prolonged broadcast storms cause IP
phones to reset, or be unable to make
or answer a call
General Troubleshooting Information, page 1
Startup Problems, page 3
Phone Reset Problems, page 5
Phone Cannot Connect to LAN, page 6
Audio Problems, page 6
General Telephone Call Problems, page 7
Report All Phone Issues with the Configuration Utlility, page 8
Troubleshooting Procedures, page 8
Additional Troubleshooting Information, page 9
Explanation
Cisco does not support connecting an IP phone to another IP Phone
through the PC port. Each IP Phone should connect directly to a switch
port. If phones are connected together in a line by using the PC port,
the phones do not work.
A prolonged Layer 2 broadcast storm (lasting several minutes) on the
voice VLAN may cause IP phones to reset, lose an active call, or be
unable to initiate or answer a call. Phones may not come up until a
broadcast storm ends.
Cisco IP Phone 6800 Series Multiplatform Phones Administration Guide
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