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Cisco Bug: CSCus18664 - 6921/41/61 Phones not registering to CUCM

Last Modified

Apr 11, 2015

Products (35)

  • Cisco Unified IP Phone 6900 Series
  • Cisco Unified IP Phone 7945G
  • Cisco Unified SIP Phone 3905
  • Cisco Unified IP Phone 9951
  • Cisco Unified IP Phone 7962G
  • Cisco Unified IP Phone Expansion Module 7914
  • Cisco Unified IP Phone 7971G-GE
  • Cisco Unified Wireless IP Phone 7920
  • Cisco Unified Wireless IP Phone 7925G
  • Cisco Unified IP Phone 7961G-GE
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Known Affected Releases

9.3(4) 9.4(1) 9.4(1)SR1

Description (partial)

6921/41/61 phones not registering to CUCM

Host-name matches some part of the domain name

Eg: If host name of the server is cisco-cucm1 and domain name cisco. The DNS query send by the phone will be cisco-cucm1 (it should be .Due to this the DNS response will fail and the phones will not be able to register as its not aware of the ip address.
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