General Troubleshooting Information - Cisco 9971 Administration Manual
Unified ip phone 8961, 9951, and 9971 administration guide for cisco unified communications manager 10.0
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Troubleshooting
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General Troubleshooting Information
The following table provides general troubleshooting information for the Cisco IP Phone.
Table 48: 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 301
Startup Problems, page 303
Phone Reset Problems, page 306
Phone Cannot Connect to LAN, page 309
Cisco IP Phone Security Problems, page 309
Camera, Audio, and Video Problems, page 313
VXC VPN Troubleshooting, page 318
General Telephone Call Problems, page 319
Troubleshooting Procedures, page 320
Additional Troubleshooting Information, page 325
Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager 10.0
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.
17
301
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