C H A P T E R
13
Troubleshooting
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General Troubleshooting Information, on page 305
•
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Phone Reset Problems, on page 309
•
Phone Cannot Connect to LAN, on page 310
•
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General Telephone Call Problems, on page 311
•
Feature Troubleshooting, on page 312
•
Phone Display Problems, on page 314
•
Report All Phone Issues from the Phone Web Page, on page 316
•
Report a Phone Problem Remotely, on page 317
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Troubleshooting Procedures, on page 317
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Additional Troubleshooting Information, on page 318
General Troubleshooting Information
The following table provides general troubleshooting information for the Cisco IP Phone.
Table 23: Cisco IP Phone Troubleshooting
Explanation
Summary
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.
Connecting a Cisco IP Phone to another Cisco IP
Phone
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.
Prolonged broadcast storms cause IP phones to reset,
or be unable to make or answer a call
Cisco IP Phone 7800 Series Multiplatform Phones Administration Guide
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