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Cisco Bug: CSCup79831 - 3905 phones do not increase the seconds elapsed counter in DHCP requests

Last Modified

Dec 06, 2017

Products (11)

  • Cisco IP Phone 8800 Series
  • Cisco Unified SIP Phone 3905
  • Cisco Unified IP Phone 9951
  • Cisco Unified IP Phone 6961
  • Cisco Unified IP Phone 6941
  • Cisco Unified IP Phone 8961
  • Cisco Unified IP Phone 8941
  • Cisco Unified IP Phone 8945
  • Cisco Unified IP Phone 9971
  • Cisco Unified IP Phone 6945
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Known Affected Releases


Description (partial)

3905 phones do not increase the seconds elapsed counter in DHCP requests. This counter is used to accomplish DHCP failover when primary DHCP server does not ACK the request (being down). Secondary DHCP will not respond until seconds elapsed reach certain preconfigured number. For these two phone models, DHCP failover does not work as counter does not increase.

Found that the 3905 & 7925 (CSCup79861) phones cannot get an IP address from the secondary server when the primary DHCP server is down.
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