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Cisco Bug: CSCuq31981 - Cisco 79xx phone DHCP behavior defect

Last Modified

Feb 12, 2021

Products (36)

  • Cisco IP Phone FW 7900 Series Software
  • Cisco Unified IP Phone 7945G
  • Cisco Unified IP Phone Expansion Module 7914
  • Cisco Unified Wireless IP Phone 7920
  • Cisco Unified IP Phone 7971G-GE
  • Cisco Unified IP Phone 9951
  • Cisco Unified IP Phone 7962G
  • Cisco Unified IP Phone 6941
  • Cisco Unified IP Phone 7941G
  • Cisco Unified IP Phone 7961G-GE
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Known Affected Releases


Description (partial)

This defect was found during DHCP migration. Seems the phone caches DHCP IP address unless the DHCP discover process is triggered by phone reset. As comparison, other network device can adopt the new DHCP IP address after the new DHCP server acknowledge the DHCP lease renew request and use the new DHCP IP for the future renewal.

Phone model : 7961/ 79XX
Firmware Version : SCCP41.9-3-1SR2-1S
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