Verifying That The Phones Have Not Been Intentionally Reset; Eliminating Dns Or Other Connectivity Errors; Checking Power Connection - Cisco 7975G Software Manual

Administration guide for cisco unified communications manager 7.0 (sccp and sip)
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Cisco Unified IP Phone Resets Unexpectedly

Verifying that the Phones Have Not Been Intentionally Reset

If you are not the only administrator with access to Cisco Unified Communications Manager, you should
verify that no one else has intentionally reset the phones.
You can check whether a Cisco Unified IP Phone received a command from
Cisco Unified Communications Manager to reset by pressing the Settings button on the phone and
choosing Status > Network Statistics. If the phone was recently reset one of these messages appears:

Eliminating DNS or Other Connectivity Errors

If the phone continues to reset, follow these steps to eliminate DNS or other connectivity errors:
Procedure
Use the Erase softkey to reset phone settings to their default values. See the
Step 1
Cisco Unified IP Phone" section on page 9-14
Modify DHCP and IP settings:
Step 2
a.
b.
c.
Step 3
On the Cisco Unified Communications Manager server, verify that the local host files have the correct
Cisco Unified Communications Manager server name mapped to the correct IP address.
Step 4
From Cisco Unified Communications Manager, choose System > Server and verify that the server is
referred to by its IP address and not by its DNS name.
From Cisco Unified Communications Manager, choose Device > Phone and verify that you have
Step 5
assigned the correct MAC address to this Cisco Unified IP Phone. For information about determining a
MAC address, see the
page
Power cycle the phone.
Step 6

Checking Power Connection

In most cases, a phone will restart if it powers up by using external power but loses that connection and
switches to PoE. Similarly, a phone may restart if it powers up by using PoE and then gets connected to
an external power supply.
Cisco Unified IP Phone 7975G Administration Guide for Cisco Unified Communications Manager 7.0 (SCCP and SIP)
9-8
Reset-Reset—Phone closed due to receiving a Reset/Reset from Cisco Unified Communications
Manager Administration.
Reset-Restart—Phone closed due to receiving a Reset/Restart from Cisco Unified Communications
Manager Administration.
Disable DHCP. See the
"Network Configuration Menu" section on page 4-5
Assign static IP values to the phone. See the
for instructions. Use the same default router setting used for other functioning Cisco Unified IP
Phones.
Assign TFTP server. See the
Use the same TFTP server used for other functioning Cisco Unified IP Phones.
"Determining the MAC Address of a Cisco Unified IP Phone" section on
2-13.
for details.
"Network Configuration Menu" section on page 4-5
"Network Configuration Menu" section on page 4-5
Chapter 9
Troubleshooting and Maintenance
"Resetting or Restoring the
for instructions.
for instructions.
OL-15790-01

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