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Cisco Bug: CSCtc02741 - Phone sends DHCP RELEASE after receiving DHCP ACK

Last Modified

Feb 12, 2018

Products (28)

  • Cisco Unified IP Phone 7900 Series
  • Cisco Unified IP Phone 7971G-GE
  • Cisco Unified IP Phone Expansion Module 7914
  • Cisco Unified Wireless IP Phone 7920
  • Cisco Unified IP Phone 7962G
  • Cisco Unified IP Phone 7945G
  • Cisco Unified IP Phone 7941G
  • Cisco Unified IP Phone 6961
  • Cisco Unified IP Phone 6941
  • Cisco Unified Wireless IP Phone 7925G
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Known Affected Releases

8.5(2) 8.5(3)

Description (partial)


Third Gen Phones will send a DHCP RELEASE to the server upon receiving a DHCP ACK.

A DHCP client should only release its DHCP lease under the following two conditions :

 - Lease has expired
 - DHCP server sending a DHCP NAK


Issue is seen when the Phone sends an unicast DHCP REQUEST to renew its lease at 50% of T1
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  • Status
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