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Cisco Bug: CSCtb01996 - DNS Query Is Send out using IPv6 When it is not Enabled on CUCM

Last Modified

Feb 09, 2017

Products (3)

  • Cisco Unified Communications Manager (CallManager)
  • Cisco Unity Connection Version 7.1
  • Cisco Unified Communications Manager Version 7.1

Known Affected Releases

7.0(2) 7.1(3)

Description (partial)


CUPC Users Are Unable To Control DeskPhone


-  Communication Manager is sending DNS query for LDAP Server using IPv6.
-  If IPv6 is not configured on the DNS, the server will time out
-  The timeout of 10 second, will cause CUP/CUPC fail to control the Deskphone
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  • Status
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