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 38: 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 189
Startup Problems, on page 191
Phone Reset Problems, on page 195
Phone Cannot Connect to LAN, on page 197
Cisco IP Phone Security Problems, on page 197
Audio Problems, on page 199
Troubleshooting Procedures, on page 200
Control Debug Information from Cisco Unified Communications Manager, on page 203
Additional Troubleshooting Information, on page 205
Cisco IP Phone 7800 Series Administration Guide for Cisco Unified Communications Manager
12
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.
Note The Cisco 7832 conference phone does not
have a PC port.
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.
189