Cisco 6800 Series Administration Manual page 317

Troubleshooting
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General Troubleshooting Information
The following table provides general troubleshooting information for the Cisco IP Phone.
Table 22: 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 303
Startup Problems, on page 305
Phone Reset Problems, on page 307
Phone Cannot Connect to LAN, on page 308
Audio Problems, on page 309
General Telephone Call Problems, on page 309
Feature Troubleshooting, on page 310
Cannot Access DND or Call Forwarding Settings on the Phone, on page 313
Phone Display Problems, on page 313
Report All Phone Issues from the Phone Web Page, on page 315
Report a Phone Problem Remotely, on page 316
Troubleshooting Procedures, on page 316
Additional Troubleshooting Information, on page 317
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 6800 Series Multiplatform Phones Administration Guide
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