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IP Phone 7821 renew ip address after 5 minutes!

hello everyone

i have a customer that have  a ip phone 7821 that boot up and renew ip address after 5 min and the process continue infinite and is stranger  because  only  happened on few ip phone 7821  (firmware sip78xx.10-1-1SR2-1). the only solution of my part was to use a old firmware sip78xx.10-1-1SR1-4   after i was to reset the phone and boots fine  and conserve the same ip address.


What is the problem??

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If the phones stop rebooting

If the phones stop rebooting by firmware change then the issue may be with the specific firmware, unless you are saying issue is with certain 7821 and not all. Did you try checking any logs etc. - by browsing to the GUI or from the phone settings by checking status messages:

Ref: http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cuipph/7821_7841_7861/10_1/english/admin_guide/PA2D_BK_AB3F74DA_00_admin-7821-7841-7861-10_0/PA2D_BK_AB3F74DA_00_admin-7821-7841-7861-10_0_chapter_01100.html#PA2D_RF_S6F1CD83_00

Also check the logs etc. on the switch. If issue is with only certain phones and not all 7821 then try establishing anything in common with the phones rebooting, same floor, same patch panel, same switch.

-Terry

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