CHAPTER 12
Troubleshooting
•
General Troubleshooting Information, page 165
•
Startup Problems, page 167
•
Phone Reset Problems, page 171
•
Cisco IP Phone Security Problems, page 173
•
Audio and Video Problems , page 177
•
General Telephone Call Problems, page 179
•
Troubleshooting Procedures, page 180
General Troubleshooting Information
The following table provides general troubleshooting information for the Cisco Unified IP Phone.
Table 27: Cisco Unified IP Phone General Troubleshooting
ExplanationSummary
Cisco does not support connecting an IP phone to another IP phone through
the PC port. Each IP phone should directly connect to a switch port. If
phones are connected together in a line (by using the PC port), the phones
will not work.
Connecting a Cisco Unified IP
Phone to another Cisco Unified
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 Unified IP Phone 8941 and 8945 Administration Guide for Cisco Unified Communications Manager 10.0 (SCCP
and SIP)
165
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