Troubleshooting - Cisco 8851 Administration Manual

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, page 277
Startup Problems, page 279
Phone Reset Problems, page 281
Phone Cannot Connect to LAN, page 282
Audio Problems, page 282
General Telephone Call Problems, page 283
Feature Troubleshooting, page 284
Phone Display Problems, page 285
Report All Phone Issues from the Phone Web Page, page 287
Troubleshooting Procedures, page 287
Additional Troubleshooting Information, page 288
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 8800 Series Multiplatform Phones Administration Guide
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