Troubleshooting; General Troubleshooting Information - Cisco 7800 Series Administration Manual

Troubleshooting

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General Troubleshooting Information

The following table provides general troubleshooting information for the Cisco IP Phone.
Table 23: 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, on page 305
Startup Problems, on page 307
Phone Reset Problems, on page 309
Phone Cannot Connect to LAN, on page 310
Audio Problems, on page 311
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
Troubleshooting Procedures, on page 317
Additional Troubleshooting Information, on page 318
C H A P T E R
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 7800 Series Multiplatform Phones Administration Guide
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