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Cisco Bug: CSCus32216 - Phones not falling back to the call manager from SRST in DNS serve

Last Modified

Feb 16, 2018

Products (36)

  • Cisco Unified IP Phone 7900 Series
  • Cisco Unified IP Phone 9951
  • Cisco Unified IP Phone 7945G
  • Cisco Unified IP Phone 7971G-GE
  • Cisco Unified Wireless IP Phone 7920
  • Cisco Unified IP Phone 7962G
  • Cisco Unified IP Phone Expansion Module 7914
  • Cisco Unified IP Phone 6961
  • Cisco Unified IP Phone 7911G
  • Cisco Unified IP Phone 6941
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Known Affected Releases


Description (partial)

Phones are not falling back to CUCM after DNS timeout on the phone in a DNS enabled environment.

The phones which go in to SRST mode does not register back to CUCM once the services are up.
the issue is noticed when the phone uses DNS name for CUCM and resets after falling back to SRST mode.
When the DNS is not reachable the phone tries to look for DNS server 3 time and times out and never tries to lookup after that.
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Bug Details Include

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